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File Version : 6.0.6001.18000 built by: WinDDK
Description : CDROM Filter Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 6.0.6001.18000
Product Name : Windows (R) Codename Longhorn DDK driver
Company Name : Windows (R) Codename Longhorn DDK provider
Internal Name : CDROM_FILTER.sys
File Size: 9728 byte(s) 9.512 KB
MD5 : 86648d85c2c9576638ff7279d4ea1867
SHA1: F3B59CCC18304D58AB7ACDE532600A429809E717

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