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File Version : built by: WinDDK
Description : Atheros L2 Fast Ethernet Controller ndis miniport driver
Copyright : 2001-2006 Atheros Communications, Inc. All Rights Reserved.
Product Version :
Product Name : Atheros L2 Fast Ethernet Controller
Company Name : Atheros Communications, Inc.
Internal Name : l260x86.sys
File Size: 29184 byte(s) 28.512 KB
MD5 : ee67f3634096d49df6ed2d43ddabf290

Download kl1.sys
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How to Install kl1.sys
Repair Sys ProblemsFixing a corrupted or missing kl1.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.