ATI Radeon 8500DV problem

> I have an ATI Radeon 8500DV All inWonder, using XP, and have just downloaded
> the latest drivers from ATI today, including the WDW TV capture drivers, but
> have not yet installed them. The reason for downloading is that I lost the
> ATI DVD player facility a while ago after updating my Microsoft Media Player
> to V9.0. Now I have re-installed the ATI driver set from the original CD,
> again, and the DVD player has finally returned, but now I have lost the TV
> tuner! Before I install the new ATI drivers, I understand the old ones have
> to be de-installed first. So if anyone out there knows that if after
> removing the old drivers, I can still view the output via the ATI card, or
> will I have to connect the video cable to the on-board video card before
> installing the new ATI drivers. If so, I'm not even sure if the on board
> card has been disabled as I bought the PC with the ATI card already
> installed. I've printed off all the installation guides for the new drivers
> and the first thing mentioned is to de-install all current drivers. Can
> someone assure me please that I will still be able to see a display before I
> proceed.
> Thanks,
> Steve