Have an inspiron 2200 laptop with 512ram, 6 months old & hardly ever used. All of a sudden it slowed to a crawl. I have cleared off any rubbish i can find, defragged it and virus scanned it but its still cruel. Not too much s/w on it, office, skype, picasa & a few other odds & ends, nothing that isn't already on a few computers I have dealings with. Any suggestions.