Hello LesSlashPaul!
You mentioned "a stupid Star Wars Ep. 3 bootup screen". Well you actually had to install that, right?!
What ever program you used to install that bootup screen, uninstall it with ALL its files. If you already uninstalled it, reinstall it and uninstall it again with all files.
That should bring your startup back to norm.
Also you could read this Microsoft article for more Startup info.:
http://support.microsoft.com/default.aspx?scid=kb;en-us;308041
Good Luck and please post back with your results so that we all can benefit.