Thanks Steve.. I'll give it a go when I get home.. When I initally set up Media Centre you had to select the TV source..
S-Video 1, S-video 2, Composite 1, Composite 2.
It did it automatically this time so I went back in and did a manual selection. If I remember correctly I got a black and white picture on S-Video 1 the last time so I selected Composite... This time I can only get a picture on S-Video 1 (which is black and white) and when I selected Composite 1 I only get sound.
The odd thing is that I should't have to change the set up of the NTL or Starview box I use as this was working fine before I upgraded the PC. I'll definatly double check later though!
Thanks Again.