Hmmm

Usually sony equipment is quite good at being versatile in its OS usage and change, so I cant see a forced OS useage on thsi one, as Sony arent tied to anybody on this front.

Have you tried F2 to enter setup, or you could try F8 for Windows startup options, other than that consult your sony vendor on it (not the helpline as thisll charge youa fortune!!!) or you could consult the website on the latop specifics and see wht this says.

Hope this helps

Kai