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File Version : 0xFF.0xFFFF.00.0000 built by: WinDDK
Description : Sample NDIS 6.0 Intermediate Miniport Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 0xFF.0xFFFF.00.0000
Product Name : Windows (R) Codename Longhorn DDK driver
Company Name : Windows (R) Codename Longhorn DDK provider
Internal Name : MUX.SYS
File Size: 19968 byte(s) 19.512 KB
MD5 : e6472a4007fb17d27d4091abd657a291
SHA1: 2F0C4AE6C4DC6BD44B1666175772EAE679A5C86F

Download rt86win7.sys
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How to Install rt86win7.sys
Repair Sys ProblemsFixing a corrupted or missing rt86win7.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.