i found a simple fix for those of us who want to start using User Objects and we have win 7 or vista.
all you need to do is go the the grasshopper install folder and add WRITE permission for the grasshopper folder for the USER account. see image
usual location of grasshopper folder:
C:\Program Files (x86)\Rhinoceros 4.0\Plug-ins\
change the permissions for the grasshopper folder to look something like this
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