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File Version : 5.2.3790.0 built by: WinDDK
Description : Crystal PCI WDM Audio Driver
Copyright : Copyright (C) Crystal Semiconductor Corp. 1996-2001
Product Version : 5.2.3790.0
Product Name : Crystal CS4281
Company Name : Crystal Semiconductor Corp.
Internal Name : cwrwdm.sys
File Size: 48640 byte(s) 47.512 KB
MD5 : 40b5ac2e4e9066d77f097c6c6faa778a
SHA1: 203A4692085CD66FCC5CC3EBD79DA56BFFDA70B6

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