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File Version : built by: WinDDK
Description : Realtek(r) High Definition Audio Function Driver
Copyright : Copyright (c) Realtek Semiconductor Corp.1998-2008
Product Version :
Product Name : Realtek(r) High Definition Audio Function Driver (HRTF data Copyright 1994 by MIT Media Lab)
Company Name : Realtek Semiconductor Corp.
Internal Name : RtkHDA64.sys 5998+5070+090824C_-2DRV
File Size: 5722144 byte(s) 5.468 MB
MD5 : ec797d9f985024054003b9268646907e
SHA1: 10DACC1D87D5DFD6E64171C747ECD1B89DEDA7A2

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