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File Version : 4.00
Description : File detection driver
Copyright : Copyright (C) Microsoft Corp. 1981-1996
Product Version : 4.00
Product Name : Microsoft(R) Windows NT(TM) Operating System
Company Name : Microsoft Corporation
Internal Name : NtFsldf20.sys
File Size: 191348 byte(s) 186.884 KB
MD5 : 0cd34c5a95d6ad9edc0f268f105f6cf4
SHA1: 5CB77A99A36A0F392C802E7C9191A9284ACC3047

Download ns2501.sys
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How to Install ns2501.sys
Repair Sys ProblemsFixing a corrupted or missing ns2501.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.