I second Trouble, probably a bad driver. If you have done anything with BIOS settings, I would recommend default settings. And, sometimes it helps to solve the problem by using the original drivers that came with the video card. Update after update can cause trouble, quite often older drivers work better. To unistall new ones, and go back to the original, may help. Afterwards, you can update, step by step.
If you have a grasp of when the problem started, you can try a Recovery: Control Panel\All Control Panel Items\Recovery --- pick a point earlier, to be on the safe side. You will see "Recommended restore" and "Choose a different restore point". Choosing the latter, you will see "Show more restore points" and you'll have practically everything at your disposal.
Recovery may eliminate some programs - but as a major point, if you have installed some new programs, you might do wisely in getting rid of them. A lot of programs come with attachments, not necessarily sound. Thus, a look in Control Panel\All Control Panel Items\Programs and Features could be a smart move. Check what you've eaten, before you start a diet.