It could be a video driver issue, but it could also be bad RAM or a failing hard drive. What it almost certainly isn't, is Photoshop. If you already have backup, don't open and resave anything, just leave it. If you don't, back up as much as you can now.
Are these distorted tiles consistent? Can you zoom in on them? If no to both, try an updated video driver. If yes, it's probably genuine corruption.