|The "hidden files and folders" you are looking for are known as "System Files"|
They are hidden for a VERY good reason, most people will only make matters MUCH WORSE by messing with their system files!
I suggest you start by buying "Windows XP for Dummies" and reading it before messing with those files.
PS: it will also teach you how to find your "hidden files" and a thousand other things!
Embrace paranoia, they ARE out to get you!