i just installed XP pro with service pack 3 on a computer that had XP Pro with service pack 3 on it hoping to resolve some problems, now it won start without a new microsoft activation. i have already downloaded a new key when i loaded it, but it will not go past log in....
Boot into "Safe Mode". To do this, turn the laptop on and press F8 as it is booting up. Go into "Safe Mode" by choosing the "Safe Mode" option.
Once you are at the desktop in "Safe Mode", Click "Start" then click "Run".
At the run command prompt type the following EXACTLY
*NOTE: The "Oo"'s in Oobe are "oh's" - not "zero's" There is one space after rundll32.exe. It is case sensitive as far as I know.
Wait a few seconds - the screen may blip a few times or so.
This just reset Windows Activation for 30 days.
Reboot the PC into normal mode - log in - re-activate Windows