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File Version :
Description : ATI WDM BT829 MiniDriver (A)
Copyright : Copyright (C) 2002 ATI Technologies Inc.
Product Version :
Product Name : ATI WDM BT829x
Company Name : ATI Technologies Inc.
Internal Name : ativbtxx.sys(MV)(NI)
File Size: 56623 byte(s) 55.303 KB
MD5 : d649c57da6fa762c64013747e5d7d2d6
SHA1: 438A7272E0AC3E7AC660487CBB89152940A0D4FF

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