If you installed Deskscapes 2.x or 1.x on Windows 7 then that would explain the problem.
Only Deskscapes 3 and above support Windows 7.
I think the best solution would be to install Deskscapes 3 trial and then uninstall that. It should hopefully undo the changes made by Deskscapes 2. Note that if you installed the hacked DreamScene on Windows 7 it will not fix that.