Hi guys
I had the same problem when I ran ccleaner as noted by @elrafaargentino above. Basically i ran cclener and after restart the screen resolution was messed up.
- When I tried to adjust this I couldn't go beyond 1280x720.
- Opening dxdiag caused the error message "Error: could not retrieve driver information"
- There was a yellow sign close to the Nvidia driver in the device manager page
fortunately after I updated Nvidia's drivers from their website the issue got fixed