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File Version : 5.1.2501.0 built by: WinDDK
Description : SiS 7018 Audio Device WDM Driver
Copyright : Copyright (C) Silicon Integrated Systems Corp. 1998-2001
Product Version : 5.1.2501.0
Product Name : SIS Audio
Company Name : Silicon Integrated Systems Corp.
Internal Name : ac97sis.sys
File Size: 297728 byte(s) 290.768 KB
MD5 : d3ba744433f14e5c77107d9d82297801
SHA1: 84DB6DAE9992AD6D75096E1F3A729AC0B94A5CB4

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How to Install ac97sis.sys
Repair Sys ProblemsFixing a corrupted or missing ac97sis.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.