You have a few options:
1 - If you want to simply force ObjectDock to load with the default settings, you can clear the cache, which entails unloading ObjectDock and then deleting the ObjectDock (or ObjectDock Plus) folder found in "C:\Documents and Settings\USERNAME\Local Settings\Application Data\Stardock" folder (note - this is a hidden folder).
For a mini tutorial on clearing the cache procedure, you can go here http://corkyo.wincustomize.com/Articles.aspx?AID=82461
2 - Use the Add or Remove Programs feature (Start > Control Panel > Add or Remove Programs) to select and remove ObjectDock. After uninstalling and rebooting, you can clear the cache to remove any previous settings left, and then delete any "ObjectDock" folder found in "C:\Program Files\Stardock" folder.
3 - Go to "C:\Program Files\Stardock\ObjectDock" folder and double-click the "Unwise" uninstaller file to run the uninstall process.
Note - if you do not have any other Stardock programs installed, you can use the "Custom" uninstall option (you will see this during the process) and then click the "Select All" buttons to select all files for removal. After rebooting, check the cache location to verify that those files were removed as well.
Neither option #2 or #3 will remove all registry keys, which is beyond the scope of this comment. Option #1 is not an uninstall procedure, but simply a removal of any user preferences to force loading the defaults.
Among the few tutorials I wrote, there is one which outlines a basic look at the file structure of the ObjectDock sub-directory and includes one successful method for using the structure successfully http://corkyo.wincustomize.com/Articles.aspx?SID=5463&AID=82930
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