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File version : 1015.4.0412.2012
Description : Realtek WLAN USB NDIS Driver
Copyright : Copyright (C) 2012 Realtek Semiconductor Corporation
Product Version : 1015.4.0412.2012
Product Name : Realtek WLAN Wireless USB 2.0 Adapter
Company Name : Realtek Semiconductor Corporation
Internal name : rtwlanu.sys
File Size: 1051752 byte(s) 1.3 MB
MD5 : 9ff23d784de58fb4126ae990154bf3f7
SHA1: 654BF7B0DC5F973C565F4C9105563170D2CA8492

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