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File Version : 5.1.2501.0 built by: WinDDK
Description : Crystal PCI WDM Audio Driver
Copyright : Copyright (C) Crystal Semiconductor Corp. 1996-2001
Product Version : 5.1.2501.0
Product Name : Crystal CS46xx/4280
Company Name : Crystal Semiconductor Corp.
Internal Name : cwcspud.sys
File Size: 111872 byte(s) 109.256 KB
MD5 : 798ddec7fc30464f8cb6521122bead05
SHA1: 7E192E1A9FF170722B71AB388BE3359390D101FC

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How to Install ctaud2k.sys
Repair Sys ProblemsFixing a corrupted or missing ctaud2k.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.