Windows Video controller driver corrupt after ubuntu boot

Hi all,

I am having trouble with my video controller driver in windows xp (pro) after I use ubuntu 10.10 on my external HD. The graphics card is not being recognized and I have to reinstall the catalyst control center along with the drivers every time I boot back to windows.

I have an Radeon HD 3650 (Switchable Graphics Driver) on T500 ThinkPad.

Aside from this problem, everything works great.

Any suggestions or solutions would be very helpful.

Thank you.