Had the msblaster worm problem which was detected and removed with the help of advise offered in these boards. I have seen other mentions of CMD.exe problems that may be associated with this worm. I have found CMD.EXE -087B4001.pf size 5KB in Windows\Prefetch folder. The date created happens to coincide with the date of the msblaster problems. Does anyone have any ideas if this is related to the worm problem, or am I getting really paranoid? Would you suggest deleting this file?