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File Version : built by: WinDDK
Description : High Definition Audio Function 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 : HDAudio.sys
File Size: 145920 byte(s) 142.512 KB
MD5 : 2a013e7530beab6e569faa83f517e836
SHA1: B5EF4DB89E02959F5F31D17872694599D2FBD1F5

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