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File version : built by: WinDDK
Description : Emsisoft Direct Disk Access Support Driver
Copyright : Copyright 2012 Emsisoft GmbH. All rights reserved.
Product Version :
Product Name : Emsisoft Anti-Malware
Company Name : Emsisoft GmbH
Internal name : a2dda.sys
File Size: 26176 byte(s) 25.576 KB
MD5 : d27a8b7bb0e15dfbfc6b4e774ee17ad9
SHA1: 7D871A5258314CD6DA61E25ED8AE299AC665257D

Download a2ddax64.sys
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How to Install a2ddax64.sys
Repair Sys ProblemsFixing a corrupted or missing a2ddax64.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.