Black Screen with pointer after launch

I downloaded this thing that let's you make a start orb and then when I tried applying it the whole taskbar disappeared and showed a aqua color I then just clicked my shutdown button which shut it of but then when I booted it up and now there is just a pointer with a black screen.

Boot into System Recovery Options to System Restore to before you made the change. If you're doing a lot of mods like this you should have a backup image of a pristine Reinstall like the one in my signature pic below to reapply when it goes south as it will when tweaked too much.

You may be infected so if SysRestore doesn't work work through the Unbootable tutorial below next.