I can't see how you guys remember all the links and passwords and urls. I accidentally removed my browsing history, and I still can't remember half the stuff. That's one of the main reasons I don't format it
And no, I don't know why it deteriorates with time... the best way to stop it though, is impossible. That would be not to use it at all.
I have to re-install windows xp 2-3 times a year.Now I can only activate it by telephone.It makes me wonder what will happen when xp becomes non supported.