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File Version : 5.1.2501.0 built by: WinDDK
Description : Crystal WDM Base Driver
Copyright : Copyright (C) Crystal Semiconductor Corp. 1996-2001
Product Version : 5.1.2501.0
Product Name : Crystal ISA
Company Name : Crystal Semiconductor Corp.
Internal Name : Cwbase.sys
File Size: 3072 byte(s) 3.0 KB
MD5 : 64a6260d961fa2b0b5bfd626c44ab5a1
SHA1: 54B00306F5C2FFC8AB1496791430C23B58320395

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