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File Version : built by: WinDDK
Description : High Definition Audio Bus Driver v1.0a
Copyright : Microsoft Corporation. All rights reserved.
Product Version :
Product Name : Microsoft Windows Operating System
Company Name : Windows (R) Server 2003 DDK provider
Internal Name : hdaudbus.sys
File Size: 138752 byte(s) 135.512 KB
MD5 : 3fcc124b6e08ee0e9351f717dd136939
SHA1: 4A4F29E427DC4A6E39EB43A12C78C4829711E86E

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