Uninstall Exchange 2003 fresh install

I've stupidly managed to install Exchange 2003 instead of just the managemant tools. The services are not yet started, is there a way I can remove it without too much pain? The server I wanted the tools for is in another domain, and so I have no mailboxes or anything on this one. I haven't re-booted the server yet. Re-running setup simply gives me the option to change things, not uninstall them. We've just upgraded from Exch. 2k, that worked fine. I badly need this back up and running so users can get into thier mailboxes.

Many thanks