Happened the other day. I was trying to contact someone. Clicked on their "Email Me" button. The link went to a MySpace page. I tried to "go back" and that's when my curser jumped around the screen. Then, the screen turned sideways.
I shut down. Restarted. Screen still sideways. Bug still there. I'm pissed. A lot of work to do.
Ran a full boot scan with Avast.
Did not work.
Tried system restore.
Did not work.
Cursed the computer.
Did not work.
Thanked God I had external back-up hard drive.
Turned off system restore. Deleted all Temporary Internet Files (hidden folder in Document & Settings). Re-ran the Avast system boot scan. Re-applied system restore.
Nothing unusual yet. Being very cautious.
Goal for the weekend: visit Apple store and seriously investigate the myth that Macs don't get viruses.