OK, after much research through google and testing, I have found that there is a known bug between Flash Player and the ATI Catalyst on any Vista OS.
I tried lots of different flash applications, some worked, some didn't. The youtube videos wouldn't work in full screen either, I just got a diagnally split full screen, half grey half white. This particular issue was posted here:
Adobe - Macromedia Flash Player
So I guess I'll just have to wait
Thanks anyway D