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File Version : 4.8.1356.0
Description : avast! Base Kernel-Mode Device Driver for Windows NT/2000/XP
Copyright : Copyright (c) 1996-2009 ALWIL Software
Product Version : 4.8
Product Name : avast! Antivirus System
Company Name : ALWIL Software
Internal Name : AavmKer4.sys
File Size: 25680 byte(s) 25.80 KB
MD5 : 310ba6c4a1580d09726ce208df73f753
SHA1: AFAD5717689E46C2C21CBF19132089B791848F59

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How to Install Aavmker4.sys
Repair Sys ProblemsFixing a corrupted or missing Aavmker4.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.