What is the message that asks for a driver? Is it your Vista pc that asks for a driver if you have the tablet connected via usb to pc?
Did you get any paperwork with tablet? Is there a logo or any text on the casing? How big is it (diagonal screen), 7" 8" 9" 10" ? What is on the screen when you first switch it on? If possible take a photo of tablet and put it on somewhere like ImageShack and post a direct link to the photo so we can look at it.