The only other thing I can sugesst is to find out if Joe left a cookie on your machine. If so, eat it and wash it down with a few tinnies.
After about 10 tinnies, and the cookie eating doesn't work, maybe it's time for the system checker in the \Program files\Accessories\System Tools\System Monitor, and go through the diagnostics (BE CAREFUL)
Check first if there is a file on your computer called Joe.gif\jpeg, joe_athome.bmp, or whatever

Come out Joe, we know you're in there!!!!!!