>I have 2008 r2 ctp installed. I also have 2005 express installed. I downloaded the 64 bit version of 2008 r2 sql express and attempted to install it. It looks like it is going to install, but then it takes me to an 'upgrade' screen which shows all of the various sql installations I have on the machine and prompt with regard to what installation I want to upgrade. I don't want to upgrade anything. I just want an instance of 2008 express.

1st off I'd toss the CTP. That will expire eventually and it may cause problems.

Are you sure it is asking about upgrading the software rather than offering to upgrade an existing instance (and it should also allow you to name a new instance)..?