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File Version : 5.5 built by: WinDDK
Description : NDIS 5 Driver for DNPG FDDIcontroller/PCI
Copyright : Digital Networks, LLC 2000-2001. All rights reserved.
Product Version : 5.5
Product Name : DNPG FDDIcontroller/PCI LAN Adapter
Company Name : Digital Networks, LLC
Internal Name : DEFPA.SYS
File Size: 20928 byte(s) 20.448 KB
MD5 : b72872100f4f19553a42516426491a60
SHA1: D9981F46C202504A318010ADF56F84C247EC0955

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