Anybody Else Have Weird Cursor Action?

I'm calling the tech support people in the morning, but...so weird. The Symantic peoples got the virus off my computer, but ever since my keyboard/cursor seems messed up. I'll be typing along and suddenly the cursor has gone back into the middle of another word or four words back, or jumps three lines up or five lines down or into the subject line of an email...while I'm typing. It's driving me nuts.