What errors on what files?
Did both programs (Norton Systemworks and PC Doc pro) report these same files? I don't think it's harmful software if Ewido, Adaware and Spybot (note spaces when you post, please!) didn't find anything. But to know what it is, and what you should do about it, we need to know more that you tell now.
I have started using Ewido in addition to Ad Aware & Spy bot, Cw cleaner. Nortons System works & PC Doc pro have recently found 3 active X errors that they cannot repair! The computer was acting sluggish which seem to have passed now to some degree. I'm not quite sure what they are & its the 1st time these 2 fix it programs haven't been able to fix everything they ahve found. My system Restore didn't fuction & have now gone to norton's Go Back, but regardless I don't know what to do about these. Should I start restoring all quarenteed & removed problems? There were more problems but they have been fixed. I use XP home & above programs in addition to Reg Mech. & Clean Cache.