(Thanks for your prompt reply and patience!!)
Ive disconnected the SKY altogether now! All i have is the scart adapter going into the tv (no sky scart) and still no sound.
The SKY box does have 2 scart sockets (one for tv and one for video). Would I be able to put the scart (from the pc) into the SKY box and run it through that??!
EDIT the tv has AV 1, AV 2 and AV 25. AV25 has the clearest picture. AV2 has a rubbish reception, neither of them have sound.
The two leads (red and white) that run from the scart adapter..where should they go into the pc? I have an audigy 2 (Z something) sound card.