mouse wierdness

hi, on windows and games my mice are very jerky when i move them, and i have
lots of mice including high grade gaming ones and they all do it


i also have to put the sensitivity up massively when playing games, and i
have no idea why (it seems to be way beyond what anyone else uses on vista)

they seem to do it no matter what i put the windows sensitivity/pointer
precision on aswell


under device manager it lists a ps/2 mouse with a exclamation mark next to
it, but there is not a ps/2 mouse installed

is it also possible that my usb files are somehow corrupted? if so is their
any way to repair/re-install them without formatting?


im on windows vista with sp1 and all the latest updates, but it did it
without the service pack and updates aswell


thanks for any help