I had the same problem with any dynamic dream.
It started when I loaded the following Nvidia video drivers...
GeForce Release 175 WHQL
Version: 175.16
Release Date: May 16, 2008
Operating System: Windows Vista 32-bit
I also had random system lock ups when WindowsBlinds 6.10.081 installed. When I uninstalled WindowsBlinds the lock ups stopped.
To fix it I uninstalled the video drivers and installed the following drivers...
ForceWare Release 169 WHQL
Version: 169.25
Release Date: December 20, 2007
Operating System: Windows Vista 32-bit
I then uninstalled DeskScapes and reinstalled the latest versions of WindowBlinds and DeskScapes.
Lockups are gone and the dynamic dreams work.