I have this gray dot at the bottom right hand corner of my screen that just appeared today. At first I thought it was a stuck pixel. Then I realized it was more than one pixel. So, assumed it was dust. Then I noticed that my cloned display has the same dot in the same place (TV & Monitor). Where's it coming from? Downloading older nvidia drivers but their upload is going dreadfully slow.
Hmm, that's an interesting one, i would assume it could possibly be the gpu. I would shut your system down, unplug it and reseat your video card, then see if the problem is resolved, if not try another video card or onboard and see if the problem continues. I would also recommend trying this video card in another computer to verify its not faulty.