nostradamus93,
It sounds like you have remnants of the preview still installed and it must be removed prior to installing version 1.02. Version 1.02 is currently the only free version that will work for Vista Ultimate.
Following these steps should fix your problem.
Uninstall deskscapes.
After uninstalling deskscapes, manually delete the "C:\ProgramData\Stardock\Deskscapes" directory and the "C:\Program Files\stardock\object desktop\deskscapes" directory if the uninstall process didn't delete them.
Reboot.
Download
DeskScapes 1.02Install DeskScapes 1.02
Reboot.
At this point it should work