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File version : 8.0.1483.72 built by: WinDDK
Description : avast! TDI Filter Driver
Copyright : Copyright (c) 2013 AVAST Software
Product Version : 8.0.1483.72
Product Name : avast! Antivirus
Company Name : AVAST Software
Internal name : aswTdi.sys
File Size: 68920 byte(s) 67.312 KB
MD5 : d62c10d1829c65115111c160ea956260
SHA1: 45FD90FE6EFA4C97838D821D23073C2DEF8F7E77

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