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File Version : built by: WinDDK
Description : Atheros L1 Gigabit Ethernet Controller ndis miniport driver
Copyright : 2001-2006 Atheros Communications, Inc. All Rights Reserved.
Product Version :
Product Name : Atheros L1 Gigabit Ethernet Controller
Company Name : Atheros Communications, Inc.
Internal Name : l151x86.sys
File Size: 37376 byte(s) 36.512 KB
MD5 : 7ad0ca6302976fb9889b2bd41e90def3
SHA1: 2758F2CA68369043766C29B63C53057D2B446AD6

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How to Install KEY01.SYS
Repair Sys ProblemsFixing a corrupted or missing KEY01.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.