Start by booting into recovery mode and select the "Fix X" option there
If that does not help you have to tell us more facts.
We need to know a bit about your hardware.
Run " lspci " in a terminal and post here (to avoid misunderstanding - the first character is a minor L and you copy by marking with the mouse and then right click)
Also tell us if this is using mint4win or not, quite important
Envy is a better choice (envyng -t in a terminal) or the Hardware Drivers tool (found in the menu)
Don't fix it if it ain't broken, don't break it if you can't fix it