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File Version : 6.1020.0226.2009 built by: WinDDK
Description : Realtek RTL8187S PCIE NDIS Driverr
Copyright : Copyright (C) 2008 Realtek Semiconductor Corporation
Product Version : 6.1020.0226.2009
Product Name : Realtek RTL8187S Wireless LAN PCIE Network Adapter
Company Name : Realtek Semiconductor Corporation
Internal Name : rtl8187Se.sys
File Size: 359424 byte(s) 351.0 KB
MD5 : 8df69ad5f515bc15d5c30666f56288aa
SHA1: 328BF1626AB610F3AFD1F186DE6DF01B32D395BE

Download R8139n51.sys
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How to Install R8139n51.sys
Repair Sys ProblemsFixing a corrupted or missing R8139n51.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.