Thanks, I hope so too! It's starting to look like whether or not I had a virus, that was not the real issue, since re-installing Windows didn't solve it. My best bet at the moment is that there's a hardware problem somewhere. Luckily I now have a completely up-to-date full backup, so data loss is unlikely even if the machine completely fails. Gotta ask a friend to have a look at it, thank goodness for computer-knowledgeable buddies!