I have an issue with Intel HD4000 drivers on my Windows 7 installation.
A few days ago I tried to update to the latest version of this driver and after a restart it got stuck with the default Windows VGAsave driver.
In device manager the driver is installed correctly, but it is not working. the currently installed driver is the one downloaded by Windows Update, but no other driver will work. They only show blank adapter names in display settings, like "1. (Default Monitor) on \blank\".
I tried uninstalling and reinstalling the adapter in device manager, but no luck.
I think it might be an issue with Virtu MPV I installed a few months ago.