In vista there is an option to continue (ENTER) if you choose advanced menu (F8) you can then choose disable signed driver checking. This will allow you to get in to normal windows mode without problems. <p> You can keep doing this everytime you run windows - it doesnt seem to affect anything else but of course it would be a pain - I installed several demos and and Toca3 on the same evening so I am not sure what I did to get this problem - from the notes above I guess it was the toca3