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File Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : Microsoft WDM AVC Streaming filter driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.2180
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal Name : AVCStrm.sys
File Size: 13696 byte(s) 13.384 KB
MD5 : 867d73a2e43b2ddaf0b0263f88e217ac
SHA1: 24519FF22A9B1850860704377DF05FE3600DAE6D

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How to Install ATKACPI.SYS
Repair Sys ProblemsFixing a corrupted or missing ATKACPI.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.