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Yeah, it usually is best. If you get away with installing over the top, then good on ya
Woody, I don't know what say mate... Apart from nuke it from it orbit.
Figured out where i went wrong.. and partly amds fault too.
Redownloading was the answer, im just an idiot.
I grabbed the driver from the 'latest amd gpu drivers section' using the windows7/windows8 x64 link, it gave nothing but a windows 7 driver in there and i haddnt noticed. But really AMD, no error to say wrong os version on installation!
Manually selecting my card and exact os from the 'Driver + Download centre' gave me the windows 8.1 driver i needed.
And now its working as it should.