Peter,
Its hard to say at a distance what to delete but the good thing is that you moved away from the program files location to just c:\.
Even when you are on c:\ there are usually a few files in the X86 location for some reason thats beyond my knowledge. I would think you would be able to delete the RB 2009 without any problems, i did a while ago. Other than that my advice would be to leave well alone. Now that you have got the updater pointing to the correct location you should have no further problems with it.
Alan