Force Win8 Graphics Driver Change?

I've upgraded a pretty new Sony VAIO latop to Windows 8.

Generally happy, but have hit a problem with the Graphics Card - basically failing to run Minecraft as it can't access Open GL mode.

The card is a ATI Mobility Radeon HD 5000. The driver is 8.97.10.6, dated 19/06/12.

I've tried Windows Update, Sony support site driver, AMD/ATI drivers - latest, beta & legacy. I either get told there is some 'compatability error' or that the driver is up to date already. Nothing works.

(I had previously noticed that I'm getting no picture from DVDs, no doubt related to this.)

Thanks,
Heeb