can't install 2007

I'm trying to install 2007 on a machine that already has2006installed on it.  I have full admin rights but I keepgettinga message stating that the computer needs to be rebootedtocomplete the initial installation of windows installer.

After rebooting, and trying again, I get the same message.

I deleted 2006 from the computer, reinstalled it, and got theexactsame message when trying to install the service packs. Itried to install 2007 (again) and also got the samewindowsinstaller message.

I really need to get 2007 on this computer.  Can anyonepointme in the direction as how to fix this?  Thanks!!

JoeSolidworksAdministration