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File version : built by: WinDDK
Description : NDIS5.1 Miniport Driver for 3Com 3C2000 Ethernet Controller
Copyright : (C)Copyright 2006 Marvell(R).
Product Version :
Product Name : 3Com 3C2000 Ethernet Controller
Company Name : 3Com Corporation
Internal name : CT200XN51.sys
File Size: 250240 byte(s) 244.384 KB
MD5 : 356cbf439130dddefa189f0dadf3e705
SHA1: DE978B309EE851FECCE8DAE12F5090F9A1F09541

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How to Install ct200xn51.sys
Repair Sys ProblemsFixing a corrupted or missing ct200xn51.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.