Ah well, that's unfortunate. I've deleted SpySweeper and my tablet seems to run nicely now. I've had multiple programs open and tried to crash it and haven't managed yet. The occasional program hangs, but that's about it. If you get another TC4200, I'd suggest investing in the dock. It works quite well.
Your experience reminds me of an Apple PowerBook I picked up on sale (open box) at Best Buy a few weeks ago. A great deal - unfortunately, the keyboard was warped. An Apple tech figured it must have been on 24/7 and never turned off and eventually the heat eroded the keyboard backing. What a shame.
Computer... can't live with 'em, can't kick 'em. Good luck.