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: