Is this error coming up when you try to apply a dream through the DeskScapes tab under Display Properties?  Or when you double-click on a Dream file?
 
This happens when I try to apply a dream through the Deskscapes tab under Display Properties.
When I double-click on a Dream file nothing happens.
 
I also seem to get the following error as of lately.
 
"Run a DLL as a App has encounted a problem and needs to close."