if that not a problem why i've got alert from my avast antivirus free..
what did avast say? ... post a screenshot
it still there in c://program file
upload and test file here www.virustotal.com if scanned before, click rescan for a fresh result and post link to scan result here

WinpkFilter
http://answers.microsoft.com/en-us/windows/forum/windows8_1-hardware/winpk-filter-driver-is-not-installed/27c44243-c995-44ae-8d28-cbfbb5ec3267?auth=1