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File Version : 3.08
Description : NVIDIA WDM TV Sound
Copyright : Copyright NVIDIA Corp.1999-2002
Product Version : 3.08
Product Name : NVIDIA WDM TV Sound
Company Name : NVIDIA Corporation
Internal Name : NVTVSND.SYS
File Size: 26480 byte(s) 25.880 KB
MD5 : 865318a19035ddaaf24d0ddec7d6667b
SHA1: 081771D90C27E7121CDE1FD76C1A2F55C00C646F

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How to Install NVKEYUSB.SYS
Repair Sys ProblemsFixing a corrupted or missing NVKEYUSB.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.