To reinstall your graphics drivers, if you are on Windows, which I presume you are, you can go to COMPUTER on the start menu quick links which you usually find on the right, and instead of left clicking on it, right-click and click on Manage which will lead you to a Computer Management window. From here, we want to go to Device Manager from the list on the left and in there you will find a list of all the devices connected to your computer at this current moment in time. From this list, you will have to find your graphics card. Once you have found that, right-click on the graphics card and click on Update Driver Software. From there, windows will try to reinstall/update your graphics drivers.
Not too sure if this will work 100% so it may be best following these steps first then if it doesn't work afterwards, looking it up on Google. c: