Perflib_Perfdata_5e0.dat Perflib_Perfdata_5ec.dat Perflib_Perfdata_630.dat Perflib_Perfdata_648.dat
They are not infections.
Any app or program that installs a performance monitoring function can create those, and they ar safe to delete. You can stop them being created by doing this:
To stop your Performance Logs and Alert service, click Start>Run. Type “services.msc” (no quotes) in the run dialog box […]