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File version :
Description : NDIS6.30 Miniport Driver for Marvell Yukon Ethernet Controller
Copyright : Copyright 2002-2011 Marvell?. All rights reserved.
Product Version :
Product Name : Marvell Yukon Ethernet Controller
Company Name : Marvell
Internal name : YK63X64
File Size: 287232 byte(s) 280.512 KB
MD5 : b1eaa8b6e1a6fdb97546db0af89a7803
SHA1: 86B2400266FFE3CA645DF2FED5A071F2FE82283C

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How to Install yk63x64.sys
Repair Sys ProblemsFixing a corrupted or missing yk63x64.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.