TODAY:

12/3/2016 new driver models for direct download:552
LOGIN
A4tech Kb 820 5 stars review"The best driver WIKI ever! I wil keep coming back for sure."Eric Smalter, Boston, MA
Supported languages for A4tech Kb 820
Certifications for A4tech Kb 820
5 stars for A4tech Kb 820 "WOW! Finally my PC got up to speed!" Melany Kim 7/18/2015

Checking...for 12/3/2016 Updates

All drivers on semantic.gs are updated on daily basis.

However, a new version of A4tech Kb 820 might have been uploaded since our last site update.

A4tech Kb 820 Driver Download

Windows Compatibility for A4tech Kb 820 driver

A4tech Kb 820 Driver Details:

A4tech Kb 820 File Name: a4tech_kb_820.zip

A4tech Kb 820 Driver Version: 302.6H6-C

A4tech Kb 820 ZIP Size: 119.kb

Manufacturer: A4tech

A4tech Kb 820 was fully scanned at: 11/30/2016
Scan Status: driver download scanOK

A4tech Kb 820 special revision for: Windows 10 32 bit, Windows XP Home Edition N 32 bit, Windows XP Starter Edition 32 bit, Windows XP Media Center Edition 64 bit, Windows 7 Service Pack 1 (Microsoft Windows NT) 64 bit, Windows Vista Ultimate 64 bit

A4tech Kb 820 Download Stats:

Driver Uploaded: 11/14/2016

Direct Downloads: 592
Most Recent Download: 12/2/2016
Managed Downloads: 943
Most Recent Download: 12/2/2016
Download Mirrors: 1
Current Delay: 24 Seconds
Driver License: GPL

Direct Download Success Stats:

Reports Issued By 555/592 Users

Success Reported By 129/555 Users

Driver Download Score68/100

Driver Installation Score69/100

Overall preformance Score69/100

A4tech Kb 820 35 Thumbs Up35Thumbs
Up
A4tech Kb 820 10 Thumbs Down10Thumbs
Down
A4tech Kb 820 driver direct download was reported as adequate by a large percentage of our reporters, so it should be good to download and install.

Installation Manager Success Stats:

Reports Issued By 879/943 Users

Success Reported By 759/879 Users

Driver Download Score82/100

Driver Installation Score76/100

Overall preformance Score78/100

A4tech Kb 820 715 Thumbs Up715Thumbs
Up
A4tech Kb 820 67 Thumbs Down67Thumbs
Down
A4tech Kb 820 driver installation manager was reported as very satisfying by a large percentage of our reporters, so it is recommended to download and install.

DOWNLOAD OPTIONS:

1. Direct Download

Select your OS and press "Download".

This option requires basic OS understanding.
Select Your Operating System, download zipped files, and then proceed to
manually install them.
Recommended if A4tech Kb 820 is the only driver on your PC you wish to update.

 

2. Driver Installation Manager

This option requires no OS understanding.
Automatically scans your PC for the specific required version of A4tech Kb 820 + all other outdated drivers, and installs them all at once.

Please help us maintain a helpfull driver collection.
After downloading and installing A4tech Kb 820, or the driver installation manager, take a few minutes to send us a report:
* Only registered users can upload a report.

Don’t have a password?
Please register, and get one.
/100
/100
/100
captcha

A4tech Kb 820 may sometimes be at fault for other drivers ceasing to function

These are the driver scans of 2 of our recent wiki members*

*Scans were performed on computers suffering from A4tech Kb 820 disfunctions.

Scan performed on 12/3/2016, Computer: HP RS904AA-ACP T3625.at

Outdated or Corrupted drivers:9/24

Device/DriverStatusStatus DescriptionUpdated By Scanner
Motherboards
Intel(R) E8500/E8501 Registers - 261CUp To Date and Functioning
Mice And Touchpads
eGalaxTouch USB Input DeviceCorrupted By A4tech Kb 820
ELAN PS/2 Compatible MouseCorrupted By A4tech Kb 820
Synaptics ThinkPad UltraNav Pointing DeviceUp To Date and Functioning
Usb Devices
Texas Instruments Texas Instruments USB 3.0 eXtensible Host Controller - 0096 (Microsoft)Up To Date and Functioning
Intel Motorola MTP DeviceOutdated
Sound Cards And Media Devices
YUAN STK7700DUp To Date and Functioning
Realtek AzureWave AW-CA100/100DUp To Date and Functioning
Lifeview FlyDVB-T Hybrid miniUp To Date and Functioning
Network Cards
Broadcom 1x1 11b/g/n Wireless LAN PCI Express Half Mini Card AdapterUp To Date and Functioning
Keyboards
Microsoft Keyboard Device FilterUp To Date and Functioning
Hard Disk Controller
Intel(R) 82801BA Ultra ATA ControllerCorrupted By A4tech Kb 820
Others
Intel(R) 82801EB Ultra ATA Storage Controllers - 24D1Corrupted By A4tech Kb 820
Texas Instruments Mass Storage ControllerUp To Date and Functioning
ENE ENE CB-1410/851 Cardbus ControllerUp To Date and Functioning
Intel Intel(r) AIM External TV Encoder Driver 0Up To Date and Functioning
Mad Catz Programmable Support for KeyboardCorrupted By A4tech Kb 820
Hewlett-Packard psc 1200 (DOT4)Corrupted By A4tech Kb 820
Cameras, Webcams And Scanners
Canon Canon MP160Corrupted By A4tech Kb 820
Video Cards
NVIDIA NVIDIA GeForce FX 5200Up To Date and Functioning
Input Devices
Logitech USB Human Interface DeviceUp To Date and Functioning
Port Devices
MediaTek MediaTek PreLoader USB VCOM Port (COM51)Corrupted By A4tech Kb 820
Monitors
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning

Scan performed on 12/3/2016, Computer: ECS HDC-I

Outdated or Corrupted drivers:8/20

Device/DriverStatusStatus DescriptionUpdated By Scanner
Motherboards
Intel(R) 6311ESB/6321ESB I/OxAPIC Interrupt Controller - 3504Outdated
Mice And Touchpads
Logitech Logitech Bluetooth Travel MouseUp To Date and Functioning
ELECOM HID mouseUp To Date and Functioning
Logicool HID-compliant mouseUp To Date and Functioning
Usb Devices
Sony Ericsson Sony Ericsson Device 116 USB Ethernet Emulation (WDM)Up To Date and Functioning
Hewlett-Packard HP PSC 1400 series (DOT4USB)Up To Date and Functioning
Sound Cards And Media Devices
Advanced Micro Devices High Definition-audioapparaatOutdated
Advanced Micro Devices AMD Radeon(TM) HD 6520GOutdated
ASUSTek ASUS TV7134 WDM TVTuner (FM1216ME)Outdated
Network Cards
Realtek Realtek RTL8191SE Wireless LAN 802.11n PCI-E NICUp To Date and Functioning
Keyboards
Microsoft HID KeyboardCorrupted By A4tech Kb 820
Hard Disk Controller
Intel(R) ICH9R/DO/DH 6 Port SATA AHCI Controller - 2922Corrupted By A4tech Kb 820
Others
Intel Intel(r) AIM External Flat Panel Driver 5Up To Date and Functioning
Nokia Nokia C6-00 USB LCIFUp To Date and Functioning
Cameras, Webcams And Scanners
Canon Canon MP600RUp To Date and Functioning
Video Cards
ATI RADEON X300 Series SecondaryUp To Date and Functioning
Input Devices
KME Periferica USB Human InterfaceOutdated
Port Devices
Huawei Vodafone Mobile Broadband Secondary Port Modem (Huawei) (COM28)Outdated
Monitors
Sony Digital Flat Panel (1024x768)Up To Date and Functioning
Mobile Phones And Portable Devices
Acer NOKIAUp To Date and Functioning
Driver ModelOriginal Upload DateLast ModificationDriver FileFile SizeCompatible Computer ModelsAvailabilty To Instalation Manager
A4tech Kb 820 21.12081/19/201512/30/2015a4tech_kb_820-21.1208.exe148kbIBM System x3650 M3 -[7945AC1, Toshiba Dynabook T554/45KR, Lenovo 7661ZRG, IBM 1845BJ1, Panasonic CF-30CCQCZBM, Compaq VS459AA-ABE CQ5211ES, HP 700-150ef, Sony VGN-A39GP, Sony VGN-AW37GY_Q, Sony VGN-CS2, HP KT394AA-AB4 S3580D, Toshiba PSK1SE-005002GR, ASUS BM5275, IBM 8145LUC, Toshiba Dynabook EX/56LWH, Sony VGN-G11XRN_B, Acer Aspire 5670, Compaq NC760AA-AB4 SR5780AP, and more.
A4tech Kb 820 41.12.1728/23/201412/27/2015a4tech_kb_820-41.12.172.exe191kbHP D1290se-ABS PS353AA, HP AZ205AAR-ABA p6300z, BenQ Joybook T31, HP Compaq Mozart CQ50-112eo, ZOTAC ZBOXNXS-AD11, HP DF194A-ABZ 484, Intel LM1WN, HP P6-2453es, Fujitsu FMVD7BF010, Panasonic CF-30CASCZBM, LG LW40-J4XP, NEC PC-VL150GS, LG LW75-P333, HP Presario V5000, ARLT Computer Produkte Mr. Whisper X R3, and more.
A4tech Kb 820 L2.1021.1812/14/201412/30/2015xkmm-l2.1021.18.exe128kbFujitsu FMVA56CWG, Acer Aspire 1425P, WIPRO WSG52K55W7-0226, Sony VGN-NS21SR_S, IBM ThinkPad X31, HP 100-5010b, IBM System x3650 M3 -[7945AC1, Sony VGN-SZ2HP_B, Gateway FX4710-UB802A, Roemer KW28/2007, and more.
A4tech Kb 820 A1.122.1323/6/201512/30/2015a4tech_kb_820-a1.122.132.exe114kbHP KZ692AA-ABU m9373.uk-a, HP H9-1236ef, NEC PC-MK31MEZCE, HP PW774AA-ABE w5040.es, HP HP Pavilion 0 Notebook PC, Gateway FX4710-UB802A, HP DV9304EU, Fujitsu FMVXD4VR2Z, Sony SVS13A17GBB, Sony VGN-CS36TJ_U, and more.
A4tech Kb 820 I81.161.1610/20/201412/30/2015a4tech_kb_820-i81.161.16.exe35kbHP 23-d219, Sony SVT1311EFYS, Panasonic CF-19MH207NW, Lenovo ThinkPad L412, Sony VGN-TZ31XN_B, Lenovo ThinkPad T60, IBM IBM System x3200 -[7042C06, LG LW40-J4JE2, Panasonic CF-53AAC34ZG, Panasonic CF-W7BC2AXS, Sony VGN-FJ11_W, HP KZ848AAR-ABA a6510t, Dell Latitude 131L, Sony 80YP67105235, Compaq DT203A-ABF S6400FR FR410, and more.
A4tech Kb 820 X40221.13/3/201512/28/2015a4tech_kb_820-x40221.1.exe42kbMCJ P67A-SD40, Lenovo 7358W17, Lenovo ThinkPad Edge E130, Toshiba TECRA A2, HP VD019AA-UUW p6110sc, Gateway GT5418E, HP HP Pavilion dv6700, Dell PowerEdge 1600SC, Sony VGN-S45C_S, Toshiba Satellite L650D, LG LB50-CC34ZL, Medion E5218, HP Pavilion zv5000, ASUS 1016PG, Sony VPCF11E4E, NEC PC-VZ500AD, and more.
A4tech Kb 820 2.11.1061.112/4/201412/27/2015a4tech_kb_820-2.11.1061.1.exe83kbPackard Bell IMEDIA F5750, Sony VGN-NS110D, Packard Bell IMEDIA H5190, Toshiba SATELLITE PRO C50-A-1M3, MAXDATA ECO4700IW, Fujitsu FMVWMS157T, HP PE525A-ABS a509.se, ASUS 1016PG, Toshiba Dynabook Qosmio D711/T3EB, NEC PC-VL750CS, MiTAC 9525, Cybernet Manufacturing CyberMed N19, HP HP ENVY13 Notebook PC, and more.
A4tech Kb 820 1.11.142010/28/201412/27/2015a4tech_kb_820-1.11.1420.exe99kbIBM 2673CU6, Sun Microsystems K85AE, HP KX621AA-ABT a6553.is, Compaq EJ284AA-ABF SR1622FR FR540, IBM IBM System x3200 M2 -[643217G, Lenovo 7659WH9, HP Hp elite hpe410f, Sony VGN-FW26T_B, EMachines EL1332, Panasonic CF-19FDGCFWG, HP P6-2370ef, and more.
A4tech Kb 820 732722/27/201512/30/2015a4tech_kb_820-73272.exe26kbSupermicro X9DRL-7F, HP Pavilion dv4000, Packard Bell IMEDIA 6430, HP FK785AAR-ABA s3620f, MIKROLOG S800SE-C6, WIPRO WIV37555-1436, Dell PowerEdge 1800, LG RD560-C.ADB1F4, Panasonic CF-30C4TAABM, Shuttle SD10, Sony VGN-NS230TE, HP 168B, NEC PC-MJ26XRZWTSBJ, HP DX2400, and more.
A4tech Kb 820 T61.19071/5/201512/30/2015fkheahtyd-t61.1907.exe205kbSony VPCW210AB, Panasonic CF-SX2KEMDP, Sony VGN-TZ47FN, Toshiba SATELLITE L850-A903, Sony VPCSB3AJ, WINCOR NIXDORF EPC A4, IBM 8141KGR, HP HP Compaq nx7300, HP DK320A-ABA A206X, Fujitsu FMVXD4VR2Z, NEC VERSAE6301 RNF61119695, Panasonic CF-30CCQCZBM, Compaq PX631AA-ABU SR1440UK GB520, HP HP Pavilion dv9575EM, HP BN496AV-ABA HPE-170t, BenQ Joybook R55v, LG A510-U.AESGE2, Acer AX12300-U1801A, and more.
A4tech Kb 820 8032812/2/201412/30/2015jhct-80328.exe92kbPanasonic FZ-G1AABJKMY, HP PS318AA-ABY t870.dk, Fujitsu FMVL18B, HP AX351AW#ABA, LG LW40-J4JE2, HP PW572AA-B1U d1262.se, Sony VGN-FW190CU, HP S5-1217, HP H9-1386, Toshiba Qosmio X75-A, SAMSUN R710, Dell Precision R7610, HP PS306AA-AB9 a819.pt, HP WX217AV-ABA MS230z, NEC PC-LL750TG, NEC PC-GV256CLAJ, and more.
A4tech Kb 820 1.1270812/17/201412/28/2015a4tech_kb_820-1.12708.exe192kbLG LW40-J4XP, NEC PC-VL150GS, LG LW75-P333, HP Presario V5000, ARLT Computer Produkte Mr. Whisper X R3, Lenovo 6457W8Q, Sony VGN-A317S, IBM 8305VBG, NEC PC-VG32SZZEJ, Sony IRX-4390UCOE, Lenovo 7661WJ2, HP DC484A-ABA 894C, Toshiba Satellite C850-B124, IBM 2652P5U, HP KJ325AA-ABG a6440a, Compaq DC477A-ABA S3100NX NA111, Panasonic FZ-G1AABJKMY, and more.
A4tech Kb 820 X22702.12/18/201512/27/2015a4tech_kb_820-x22702.1.exe50kbToshiba Dynabook T351/34CR, IBM 6792GGU, Gateway GT5228J, Fujitsu PRIMERGY TX150 S7, Compaq EK360AA-ABZ SR1659IT IT540, Panasonic CF-52AJCBDBM, Lenovo 6075Y5X, Packard Bell IXTREME GOLD H5050, Sony VGN-P92KS, HP GN551AAR-ABA m8200, and more.
A4tech Kb 820 1.1262011/14/201412/30/2015tdfii-1.12620.exe71kbHP HP D290 MT, LG R490-KR8WK, ALFATRON SpA DN1020/M, Lenovo 20ARA024KR, HP Compaq Presario Notebook PC, OEM By O.E.M, HP ED713AA-ABF w5155.f, HP GX609AAR-ABA m9160f, Packard Bell Ixtreme M5741, NEC PC-VK26MDZCE, Ipex I.T.G GOC Guardfish series, and more.
A4tech Kb 820 W1.1038412/6/201412/28/2015-w1.10384.exe173kbHP P6-2370ef, NEC PC-LL750ES3KS, Panasonic CF-53JAWZYDE, LG E500-G.A2F1E1, Samsung N130, Fujitsu FMVNT5FT4, Compaq Presario 2700EA 470024-565, NEC PC-MJ29MLZZ1BSG, Lenovo ThinkPad X200s, ECS H57H-MUS, HCL Infosystems IGL 1701CT, Lanix LANIX CORP 4030, LG S1-P655R1, NEC PC-VL500ED, Toshiba Dynabook EX/66MWHS, and more.
A4tech Kb 820 I437738/22/201412/30/2015a4tech_kb_820-i43773.exe135kbMedion P861X, HP Presario C300, Sony VGNFW590FSB, LG RD410-L.ADA3E2, Sony VPCW210ALI, HP RJ116AA-UUW m7675.sc, HP P8315A-ABZ 451, Sony VGN-NW235F, Toshiba Dynabook T351/57CRD, IBM 2724JU1, Sony VPCX115LW, Sony VGN-NS240D, Sony VGN-SZ670N, and more.
A4tech Kb 820 N22092.12/11/201512/29/2015a4tech_kb_820-n22092.1.exe150kbCompaq EV958AA-ABF SR1804FR FR620, NEC PC-VY21MED5HJW6, Compal DL7x, Lenovo 2689PHG, Sony SVE15136CNS, IBM 8305S8U, Transource Computer Systems, HP G5261de, HP HP HDX 16, Packard Bell EasyNote_BG47-V-054FR, Sony VGC-RA204, Lenovo ThinkCentre M90z, Compaq DQ193A-ABZ S5300IT IT340, HP P6-2370ef, HP RJ172AA-ABU t3620.uk, Sony VGN-FW45MJ_B, HP VD042AA-ABF p6105f, Lenovo 7665VEH, and more.
A4tech Kb 820 21.164810/7/201412/28/2015yfvynfufp-21.1648.exe133kbLenovo ThinkStation D30, IBM 2374F14, Compaq RK531AA-ABG SR1985AN AP680, Toshiba SATELLITE L870-16L, Packard Bell ISTART 2234, Gateway T-1629, Lenovo 43772KM, HP FK913AA-ABG s3660a, NEC PC-LS350ES1KR, Fujitsu FMVLX60TY, HP HP Compaq dc5100 SFF, and more.
A4tech Kb 820 2.122349/23/201412/29/2015mbima-2.12234.exe49kbHP GX609AAR-ABA m9160f, Compaq EP103AA-ABU SR1709UK GB610, Lenovo ThinkPad R60, IBM ThinkCentre M50, Dell WN09, HP HP Compaq 6730s, HP NC684AAR-ABA a6750y, Sony VGN-SZ140, IBM ThinkCentre A50, ELITEGROUP G713, Fujitsu CELSIUS W380, and more.
A4tech Kb 820 G82022.18/24/201412/27/2015a4tech_kb_820-g82022.1.exe37kbHP 310-1125uk, HP PX588AA-ABX w5080.fi, Sony VGN-Z17GN_B, Packard Bell IMEDIA D4129 BE, HP HP nx9010, LG F1-2242HS, MCJ P67A-SD40, LG R560-U.ABLGL, Toshiba DynaBook V7, Sony VPCEH40EBW, ASUS VX5, Intel LC-92T10, Mecer X107, Lenovo 4236SUS, and more.
A4tech Kb 820 21.11.11.1310/13/201412/27/2015a4tech_kb_820-21.11.11.13.exe110kbAcer TravelMate 8372, Gateway GM5485H, Sony PCV-RS221, HP DV6 - 3206AX, HP KT394AA-AB4 S3580D, IBM 8172QGW, RIOWORKS HDAMB, HP NM920AA-ABU m9639uk, Notebook S210TU, Panasonic CF-W8GWEYZNT, Fujitsu LifeBook A6030, and more.
A4tech Kb 820 2.138779/7/201412/30/2015krp-2.13877.exe144kbSony VPCEA1S1R, Panasonic CF-SX3TETBR, MSI MS-6508, LG P2-TP2007, MCJ 9223, HP PX623AA-ABU m7071.uk, KOHJINSHA APERA Series, Acer Aspire X1470, HP S5-1021p, Sony VGN-AW290Y, Clevo P15xEMx, Gateway EC1457U, HP 810-190jp, HP 23-f390, and more.
A4tech Kb 820 1.1247712/19/201412/30/2015a4tech_kb_820-1.12477.exe135kbCybernet Manufacturing DeskBook, Sony VGN-CS62JB_R, Packard Bell IMEDIA H7653, Sony VGN-CS160F, HP FJ440AA-UUW s3542.sc, Lenovo 2007WVJ, Compaq GN732AA-ABH SR5135NL, HP Compaq nx9030, KOBIAN KOB746, VIA 2021, Gateway GT4224m, HP 3600, Panasonic CF-SX1WEVHR, PCSMART PTI1010, and more.
A4tech Kb 820 2.126838/23/201412/27/2015a4tech_kb_820-2.12683.exe183kbHP Presario 2500, Lenovo 6457WTU, HP PN135AA-ABU t790.uk, Compaq DN146A-ABA S5410NX NA310, NEC PC-BL300TA6W, ASUS W3A, Toshiba Dynabook EX/33JK, Sony VPCCA1AFJ, Panasonic CF-30F3SAXAM, Packard Bell Ixtreme i7650, Supermicro X9DRW-7/iTPF, HP 610-1130uk, NEC PC-MJ29MLZZ1BSG, IBM 2668WCG, Fujitsu FMVNP2PL, and more.
A4tech Kb 820 8288212/31/201412/27/2015a4tech_kb_820-82882.exe132kbMedion E1312, Dell Inspiron 580, Lenovo 7659V26, NEC PC-VL750AS, Toshiba Satellite L855-S5405, Fujitsu FMVNA1CE, ASUS U6Vc, Toshiba Dynabook T451/59DB, System76 Leopard Extreme, Epson Endeavor Pro8000-H, HP 700-150ef, and more.
A4tech Kb 820 802892/9/201512/27/2015pon-80289.exe81kbLenovo Lenovo IdeaPad Y485, HP NF369AA-ARL IQ522pl, IBM 2525AP5, HP 3082, VIA 2021, Fujitsu FMVFE90DBY, Lenovo 7484WWY, HP HP Pavilion dv2000, Haier T68 Series, Zoostorm 7010-0276A, Sony VGN-SZ1XP, Gateway 6020GZ, and more.
A4tech Kb 820 2492.13/3/201512/29/2015a4tech_kb_820-2492.1.exe149kbToshiba Glacier10F, Toshiba SATELLITE C850D-131, Fujitsu LifeBook T4310, HP ED713AA-ABF w5155.f, Lenovo ThinkPad Edge E330, Gateway E-5200, Panasonic CF-74KCJDZAM, IBM 8212MNA, MSI MS-16GN, Sony VGN-UX490N, LG R510-K.A275K, Sony VGN-A195EP, Toshiba Satellite A110-293, Sony VGN-SR430J, Compaq EV971AA-ABF SR1860FR FR620, and more.
A4tech Kb 820 222.193/3/201512/27/2015a4tech_kb_820-222.19.exe65kbLenovo ThinkPad W510, HP 810-150se, Panasonic CF-S10AY6DC, Fujitsu FMVXD0AH2Z, Toshiba Satellite P870, IBM 2669WCC, Compaq PE427A-ABU S7150UK GB420, Compal DL7x, Packard Bell EasyNote TR83, Compaq Presario 7110US 470016-083, NEC PC-VN770JS3EB, Toshiba Dynabook T552/47FR, HP KE485AA-UUZ m9145.ch, and more.
A4tech Kb 820 6328411/7/201412/27/2015a4tech_kb_820-63284.exe84kbPackard Bell IPOWER X9075, IBM 2373ZTS, IBM PHILIPS, Sony SVE14A2V2ES, HP Pavilion ze5600, Lenovo ThinkCentre M55, Gigabyte G1.Snipe, Gateway DX4820-23, IBM 2374258, Fujitsu FMVXD0AH2Z, HP HP Pavilion 6700 Notebook PC, Packard Bell IMEDIA 6556, and more.


There is no particular operating system known to have specific problems with A4tech Kb 820
Laptop A4tech Kb 820Tablet A4tech Kb 820Download A4tech Kb 820Upgrade A4tech Kb 820Update A4tech Kb 8202016 A4tech Kb 820Free A4tech Kb 820Data A4tech Kb 820Info A4tech Kb 820Help A4tech Kb 820Guide A4tech Kb 820Comments A4tech Kb 820Windows 10 A4tech Kb 820Vista A4tech Kb 820Windows 7 A4tech Kb 820Install A4tech Kb 820