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File Version : 2004.2.1.10
Description : AV Engine
Copyright : Copyright (C) Symantec Corp. 1991-2004
Product Name : Symantec Antivirus Engine
Company Name : Symantec Corporation
Internal Name : navex
File Size: 333731 byte(s) 325.931 KB
MD5 : 63666ef2a68d9f30fff428adb25b76e6
SHA1: 28F624E286E008F85FB12B4D78F951F8F3ABF86B

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