Have you just used print screen? Because I'm not seeing anything wrong there...but I think I know what you mean.

Check your VGA/DVI cable before anything else, jiggle it about, try a different one. Sounds a lot like something that's happening with my spare monitor at the moment because I've got it across the room from the PC so there's a couple of extension cables. Because of this the connection isn't perfect and I get a ghosting effect on most things. Doesn't bother me though because I only use it for files and downloading.