There is a problem with your selected data store

You have to Start->Run->'cmd', then change directory to the \windows\Microsoft.NET\2.0whatever\

Then run the aspnet_regsql.exe wizard.  It will walk you through creating the tables that the Config manager page should have done.

I ran the aspnet_regsql.exe from the command line with the appropriate parameters and it worked:

C:\Windows\system32>aspnet_regsql.exe -E -S propmancom\propmancon -A r

Start adding the following features:
RoleManager