I've got a pretty darn serious problem.... When my comp has been on for an average of 30 seconds, explorer takes a minimum of 50% of my cpu. Along with approx. 150 mb of my RAM. That is annoying. Performance is, needles to say, ROTTEN. I suspect hyperthreading has a part in it, as 50% cpu would seems to round a figure to be just coincidental. I suppose i could turn off HT, or maybe reinstall windows, but these are not satifactory sollutions. My comp is: Abit AI7 (intel 865), 512 kingston hyperX(dual), 3 ghz intel HT (socket 478, 800 mhz fsb), various harddisks(two of them on a fasttrack100 raidcontroller) Win XP with sp1 Any help would be much appreciated!