You may have to downgrade your OS if your GPU doesn't support win 10. You can probably try some driver rigging for win7/8 compatibility, otherwise downgrading or buying a new gpu (that supports windows 10) will be required to fix this most likely. -V
Marking as solved, as there is nothing we can do for any further for you. Here is a post with some more information regarding this issue. Have a nice day! -Colin