I have SP2 on my computer and the only thing I can say is that after you install it, you have to reconfigure your whole system. It will make ALL microsofty programs the default. Try disabling 'Messenger' and 'Outlook' in your "Set program access and defaults" on the "Start" menu bar. Make sure you check ALL the settings in the control panel for your power backup. Right click on 'my computer' and check all your hardware setting. Just look them all over and make sure that they have the current hardware listed that YOU have on your computer. AND last, check your bios settings!
Hope this helps.