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File Version : 5.00.2195.02
Description : QSB Port I/O
Copyright : Copyright (C) Microsoft Corp. 1981-1999
Product Version : 5.00.2195.02
Product Name : QSB driver
Company Name :
Internal Name : qsb.sys
File Size: 5560 byte(s) 5.440 KB
MD5 : 05f00f1c002cf3ffa3cfb4da9576ba77
SHA1: D808C6C7E3B11380FF35FA93E7F736E85A0F8303

Download NS21.sys
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How to Install NS21.sys
Repair Sys ProblemsFixing a corrupted or missing NS21.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.