Hmm, I don't have windows 8 but I may be able to help.
Where are you getting the drivers for the GTX 650 from?
Don't install them from the CD that comes with the card,
install the drivers from windows update or what ever it is called on 8 or directly from NVidia.
I suggest doing the latter after installing the drivers from windows update.
MSI boards have Live Update 5 so you could try that too.
It will give driver updates to other components that may not be in windows update.
If that doesn't work let us know.
Be sure to reboot after installing drivers.
Even if it doesn't say to do so you should do it.