Thanks again, Rob.
I was thinking along the same lines and was going to raise the question of updating the drivers. Luckily I have the driver CD and dug it out this evening - one advantage of getting someone to build your PC for you is that you end up with all the relevant CDs and the instruction books!
It appears to be relatively simple so I'll have a bash at it and report back. I note that you can buy updates for the BIOS on the web, I don't know if that is worth doing. Maybe think about that when I have sorted out the sound.
Again, thanks for your help.
GG