well, except sp2. unless you have the actual package downloaded to a folder and did not dynamically update, you will need to do windows update again because the system dll files have been over written. drivers and what not should be fine but on rare occasions you may need to reinstall an app again, but not often, and save games and such should be fine.
If you argue with an idiot he will drag you down to his level and beat you with experience.
I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.