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File Version : 5.1.2600.2180 (xpsp_sp2_rtm.040803-2158)
Description : AVC 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 : AVC.SYS
File Size: 38912 byte(s) 38.0 KB
MD5 : 87c223adb8f7596b31caae3c67b16ddd
SHA1: CACA39CFE5077EC2F660A1F3B111C42E6D6BB3A6

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