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File Version : 3.51
Description : ATI Built-In Ethernet network driver
Copyright : Copyright Microsoft Corp. 1981-1995
Product Version : 3.51
Product Name : Microsoft Windows NT(TM) Operating System
Company Name : Microsoft Corporation
Internal Name : LAPCM.SYS
File Size: 23552 byte(s) 23.0 KB
MD5 : fedda165e90b2a5c6418d3b5be0925e9
SHA1: 7A9CB6D8BEDB2EFF185265889C1D6A5CBA7D628E

Download l251x86.sys
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How to Install l251x86.sys
Repair Sys ProblemsFixing a corrupted or missing l251x86.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.