I'm in the same boat, I ran the basic installer after watching some tutorial videos so that is all set correctly.
I had to use the following to get the version to appear...
Server Home: C:\ColdFusion10\cfusion
Document Root: C:\ColdFusion10\cfusion\wwwroot
I also had to click in the field for doc root then back then the drop menu appeared. It was a strange back and forth.
Now after setting this up I can see the server and it's tables in the RDS Dataview window on the right side of the IDE but in the "Servers" pane it shows the db as being Stopped.
I've logged into my localhost in a browser and can see all of the db info so I know it's running. There is something missing in ColdFusion Builder that is not working.