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File version : built by: WinDDK
Description : Atheros Extensible Wireless LAN device driver
Copyright : Copyright (C) 2001-2009 Atheros Communications, Inc.
Product Version :
Product Name : Driver for Atheros CB42/CB43/MB42/MB43 Network Adapter
Company Name : Atheros Communications, Inc.
Internal name : ATHR.SYS
File Size: 1570816 byte(s) 1.510 MB
MD5 : 2ea8b4392d3e9a914989eddbaef3dd86
SHA1: CF4526092AC8C4F7F636480E7B141F5690320C87

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