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File version :
Description : WCDMA USB AT Command Driver
Copyright : (C)2002 NEC Corporation
Product Version : 1.00
Product Name : WCDMA USB Driver for Windows2000/XP
Company Name : NEC Corporation
Internal name : WNUSTACH.SYS
File Size: 28304 byte(s) 27.656 KB
MD5 : 0d578e724f36fdca700f86d86bcfe957
SHA1: 1DBE275546D16AF9D7E06A6E24B69BE5A520BE12

Download tac_w2kh.sys
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How to Install tac_w2kh.sys
Repair Sys ProblemsFixing a corrupted or missing tac_w2kh.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.