This has happened to me too. I turned off User Accounts and then I had no problem.
I assume you mean User Account Control because User Accounts can't be turned off. Also turning off UAC wouldn't effect it in the slightest. All UAC does is ask permission to run applications that access/change system files, run programs that change settings, and registry. It doesn't stop bitmaps from rendering.
Also V try clearing out all your system caches.