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File Version : 8.35.171
Description : Logitech Mouse Filter Driver
Copyright : Copyright Logitech Inc. 1987-1999.
Product Version : 8.35
Product Name : MouseWare
Company Name : Logitech
Internal Name : lmoufltr.sys
File Size: 57104 byte(s) 55.784 KB
MD5 : 50eb38050b8acbd62890a5d47059681b
SHA1: 3EEF7FE278011650E90C4DC8140E53143CCFC11A

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How to Install LKBDFLTR.SYS
Repair Sys ProblemsFixing a corrupted or missing LKBDFLTR.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.