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File Version : built by: WinDDK
Description : Realtek NDIS Protocol Driver
Copyright : Copyright (C) 2003-2008 Realtek Semiconductor Corporation
Product Version :
Product Name : Windows (R) Codename Longhorn DDK driver
Company Name : Realtek Semiconductor Corporation
Internal Name : RtNdPt5x.SYS
File Size: 22016 byte(s) 21.512 KB
MD5 : 5ffd2aaf467b80fab34929afb7702060
SHA1: B37589F17D2681F45696DC908C207FEE810F23C4

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