Nah, Windows XP is 5.1.2600 (it's a standard.) And I'd really recommend that you install SP2! It shouldn't corrupt like that. My computer's more than 2 years old... and SP2 works just fine. Try to just install SP2, and nothing else with it. Also, when Windows Update recommends you to install it, it's best to do it..
Happiness is not about being perfect.
It is about seeing beyond the imperfections.