You can manually uninstall it by going into the registry, deleting all WindowBlinds stuff in there, and then going into Program Files and deleting everything in there.
@Viper - Err don't you need to uninstall it first in order to reinstall it? To manually uninstall, go to start>run>type "regedit">expand "Hkey Local Machine">expand "Software">Expand "StarDock">Expand "Object Desktop">delete everything to do with WindowBlinds Then go to C:\program files\stardock\object desktop and delete the WindowBlinds folder