I'm not sure what you are wanting to do, sargan. If you are wanting to uninstall all Stardock customizing apps for instance because you are selling the rig they are on:
Almost all Stardock content is stored in Shared Documents (XP) or in Public Documents (Vista/7). The exceptions to this are LogonStudio which keeps the logons in App Data and the old DesktopX 3.5 which kept things in Program Files. There may be others, but those I know for sure.
Provide a bit more detail please.