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File Version : 5.1.2600.0 (xpclient.010817-1148)
Description : Composite Battery Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.0
Product Name : Microsoft Windows Operating System
Company Name : Microsoft Corporation
Internal Name : compbatt.sys
File Size: 9344 byte(s) 9.128 KB
MD5 : df1b1a24bf52d0ebc01ed4ece8979f50
SHA1: 8FD882F496712D85B4CB3F5CB08C1E742C82A8DF

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