how long should a "good" computer last before files become too corrupted to function smoothly? is there a "easy" fix for corrupted files, etc? this one suffered an electrical surge, we replaced the power source...but it's soon to go away if we can't fix the SLOOOOOW performance. been running spy-ware stuff with some benefit, but frequent re-boots and pages that refuse to open are signaling the end as far as I'm concerned. advice appreciated. thanks.