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File version : 3,5,0,4
Description : MyKeyDefense Keyboard Filter Driver(AMD64)
Copyright : Copyright(C) 2005 AhnLab, Inc.
Product Version :
Product Name : MyKeyDefense
Company Name : AhnLab, Inc.
Internal name : Mkd3kfNt.sys
File Size: 166712 byte(s) 162.824 KB
MD5 : 324de68538a6be0d3f5527f8869a52c3
SHA1: 2AD003194F4393AECAA98994F2BBA5C7302624B8

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How to Install mkd3kfnt.sys
Repair Sys ProblemsFixing a corrupted or missing mkd3kfnt.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.