Right, help required folks.

Installed service pack 3 last night & whilst it was trying to reboot, it would get to the windows logo, this would then fade in colour & then i would get a blue screen & then reboot leading to the safe boot option, (wont boot up in safe mode either).
Assuming this is a critical hardware failure message, but its gone before i can read it.
Now after trial & error i realised that it was my mouse (Logitech G9) that was causing this conflict. So basically i can't boot my computer up with the mouse in any usb slot. However, if i disconnect it before booting up & then plug in once im loaded then it works fine ?
I've uninstalled mouse drivers & logitech software (& reinstalled) to no avail, so anyone got any ideas...... please
Many thanks,
Jimmybond
Have posted this in XP section aswell as i wasnt sure which section to post under. Apologies if i have done wrong.