Here's a quick run down. I installed SP3 on an installation of Windows XP Home Edition. Turns out the AMD processor in the PC is not compatible with SP3 and the PC wouln't put up past the XP splash screen. To resolve this I used the recovery console to remove SP3. Now the PC boots up to the login screen but I have no mouse or keyboard functionality. I tried all USB ports. If I try to boot into Safe Mode, I bet a blue screen with a "?", nothing else, just a question mark.
I'd LOVE to not have to reinstall Windows. Any suggestions?