What is the purpose of these two files?

On one of our computers I found two files uses a lot of cpu resources. psybnc.sys and mkserv.exe.
I terminated both files without any problems. I cannot find any references to these anywhere. I have Symantec run. Plus I ran Spybot and ad-aware. None of these programs give me any indication of what these files are doing.
Does anyone know what they are from?