I'm installing Windows 8 on my old HP. I hope I don't regret doing this. The machine has been running Vista from the day it came home from the store. The only problems I ever encountered with Vista was within the first couple of weeks of buying it, but the geeks at Best Buy worked some kind of magic on it and it's been running fine ever since. I probably shouldn't try to fix what isn't broke, but it's too late to turn back now.