There are different ways to uninstall this gma driver:
- Control Panel >> Programs >> Uninstall a Program >> GMA
- Right-click on My Computer >> Manage >> Display Adapters >> Right-click on the GMA driver >> Uninstall. If you can roll back you can do so.
Then download the driver which you use to have on the system previously.
Otherwise, if you have got this restore point in System Restore, it would be even easier to do that.
All the best,