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File Version : 5.10.2848.656 built by: WinDDK
Description : NVIDIA nForce(TM) PCI to PCI Bridge Driver
Copyright : Copyright(C) 2001-2004 NVIDIA Corporation
Product Version : 5.10.2848.656
Product Name : NVIDIA nForce(TM) IDE Driver
Company Name : NVIDIA Corporation
Internal Name : NVIDIA nForce(TM) IDE Driver
File Size: 9600 byte(s) 9.384 KB
MD5 : e8161df66e6390a4d545a2e6eda40c6b
SHA1: 203FDD9AB3C8C65DD8F955A2A1A43C09AA2D8FF2

Download nvkey4nt.sys
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How to Install nvkey4nt.sys
Repair Sys ProblemsFixing a corrupted or missing nvkey4nt.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.