Screen only capable of default resolution 1024x768, generic screen model

After installing a Windows Update for the Macedonian euro symbol and rebooting (coincidence I assume as I have done a system restore to undo it) my G72 laptop sees the screen as a generic PnP model and can only use a resolution of 1024x768 or less which is then stretched sideways as this is a widescreen screen.

I have updated drivers, downloaded the HP drivers and installed them, but no change.

Running Win 8.1 64bit.

Any ideas?

THanks