I have a Vaio VGN-Z790. I tried to upgrade to windows 10 and MS says NVIDIA GEFORCE 9300M GS driver not compatible with Win 10. Any ideas for a workaround?
You can upgrade anyways, then try that driver that Manitha linked you to. If it doesn't work, you can roll back to Windows 7. CREATE A BACKUP BEFORE ATTEMPTING THE UPGRADE! (Just in case.)