uninstall all the shuttle drivers right this second!
your a lot better off getting them of ati's webby
as for speed. i tihnk your problem here is xp64. when i used it on my SN85G4V3, i found it to be a fair bit slower than normal XP
also this is probs the first time that 32bit XP has actually been as stable as it is. definatly a decent OS now after 2 service packs and loads of other updates