In my case this tweak from Kelly's Korner worked to re-enable access to the wallpaper selection process
You don't need a path, just double-click on the .reg file and it will ask you if you want to add it to the registry.
The precaution is to open regedit (Start -> Run -> regedit), and then File -> Export making sure you select All. It's always a good idea to backup the registry, but in this case, IMHO the change is so small and benign that it's probably OK to just go ahead.
You don't import it, you just double-click it.
"Stupidity is forever - ignorance can be fixed."
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