I'm assuming it's System Properties you're talking about rather than Control Panel.
Two things to change then....one is to put text and/or a logo underneath the Windows logo, which is simple to do. The other involves you downloading a system hacking tool to replace the Windows logo. The latter is of course more risky than the first, do it at your peril.
Full details of both to be found here:
http://www.sadikhov.com/forum/Changi...ies_19954.html