Thanks for the prompt reply!
It looks as though I got confused with the product no. It was 7350 not (3750) as the driver
I first used.
I have downloaded the 8.583 Vista 64 bit as you suggested.
The Catalyst Control Centre does install and appear in the Start Menu, however upon selecting it, the program doesn't launch.
I've also tried manually updating the driver within Device Manager, Disp Adapter, and it tells me 'It is not compatible with this version of Windows'.
Is it looking like I will have to create a dual-boot, and have Vista installed on the other partition so I can use these drivers