Desktop Properties

When i right click and click properties (to bring up my display properties to change a desktop or whatever) it takes forever! I have to wait at least 30 seconds for the window to come up, and another 30seconds to apply a background. Everything else works just like normal, the slowness of the display properties just started a few days ago.

I ran Norton and mcaffe, both say i dont have viruses. I ran spybot search and destroy, and Microsoft antispyware, both turn up with nothing. Does anybody know what’s going on?