The computer has been formatted and has a clean install of Windows Vista Home Premium.
I have spoken (online) to a Sony agent, they seem to think that the recovery discs (can be ordered via telephone) are around £30, so might just do that, have also noticed that my DVD player/writer which is BluRay also won't play BRDiscs so obviously the drivers aren't right, and only Sony have the drivers, so really they've got me!
Thanks for the offer of help, am going to order the discs tomorrow, the online chap said that once I recover all drivers etc. it will correct the BIOS problem too.....if not there's going to be trouble.....lol.
Forgot to say its a Sony Vaio VGC-LT1S, the one that's built like an Apple, all workings in the back of the screen.