Buy a Mac.
Seriously... some spammer just sent me an email with that subject line advertising a product that will identify and eliminate errors, restore performance and stabilize Windows.
Here's what I really don't get.
Say you go spend your hard-earned cash for a new oven... or a new washing machine -- doesn't really matter what it is. But it's manufactured by Acme, Inc. and every six months it starts giving you trouble... and every six months, you need to go through some routine to eliminate problems that should never have occurred in the first place.
Next time you need a new oven or washing machine, are you really going to buy another Acme? Do you really believe you're stuck with Acme because you don't know how to operate another brand?
Wake up people... if it hurts when you bang your head against a wall, stop banging your head against the wall.