Was searching on google last night and was looking through page after page for a web address and a message popped up that they were under attack by a virus, to check my computer for probems. I shut down the net/browser/email immediately and started a scan. Two copies of a trojan were in my browser cash. They were of a type that goes to the net and downloads other trojans that do nasty things according to Norton. Very thankful google gave me a heads up!