me i dont like NAV. TrendMicro is good
and my dad personally uses McAfee. To each his own I guess. I might would try to scan again, and make sure you have your hurestics on deep and all that cool stuff, scanning all files is a good start. If everything else fails a DOS scan with your rescue disks might help sinse its made at startup
maybe by scanning in DOS you can find it before it creates the tmp files and fix it? Best of luck to you, Let us know what happens.
~pct