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File Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : ACPI Driver for NT
Copyright : (C) Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.2180
Product Name : Microsoft(R) Windows(R) Operating System
Company Name : Microsoft Corporation
Internal Name : ACPI.sys
File Size: 185600 byte(s) 181.256 KB
MD5 : 5ecd0c75cf5ebd2c2847ec93b2021322
SHA1: BD87FBB22415E483C6CE9C4E1677D20E377EDE9C

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