When I attempt to install the Beta2 version, I get "Another version of this product is already installed..." and it continues on to inform to to use Add/Remove in control panel to remove the old version.

I did just that AND rebooted the computer and I still get this same error message.

Any help would be appreciated.

My fault.  I missed the entry in Add/Remove Programs for "ASP.NET 2.0 AJAX Extensions..."

 I made the mistake of assuming all ASP.NET AJAX refererences in Add/Remove Programs would be listed under Microsoft.