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File Version : 4.00
Description : RIVA 128 Windows NT Graphics Driver
Copyright : Copyright (C) NVidia Corp. 1996-1997
Product Version : 4.00
Product Name : RIVA 128 Windows NT Graphics Driver, Version 1.50e
Company Name : NVidia Corporation
Internal Name : nvgfx.sys
File Size: 24256 byte(s) 23.704 KB
MD5 : 2fc525522965935df48e4e8ca0a2e1f8
SHA1: 85623BC3DECE2559E3E44646E49B808720A93D38

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