Ok, try the following...
1, click

and type
Device then click
Device Manager
2, click the expand icon next to
Display adapters
3, right-click the
Standard VGA adapter and select
Uninstall 
Note
Make sure to tick the
Remove driver software box if it shows
4, Reboot your machine
This will hopefully force Windows to re-detect your GFX adapter. If asked, allow Windows to search Windows Update for
drivers.