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File Version :
Description : ZD1211 802.11b+g USB LAN Driver
Copyright : Copyright (C) ZyDAS Corporation 2002-2006
Product Version : 1, 2, 1, 1
Product Name : ZD1211 802.11b+g USB LAN Adapter
Company Name : ZyDAS Technology Corporation
Internal Name : 1211 driver
File Size: 290304 byte(s) 283.512 KB
MD5 : 69fa06a9da8d727d58fbe35e0a1adb7d
SHA1: FD577C16E29E1A272D8842D9CFA9A79C26E507DE

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How to Install wvchntxx.sys
Repair Sys ProblemsFixing a corrupted or missing wvchntxx.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.