I downloaded the trial version of Light Room 3.4.1 yesterday. Played with it some yesterday and and today was in the process of creating a new catalog. It shut down and gave me the message that 64 bit quit working. Now it does this everytime. I am operating on an HP G72 with windows 7. I have 399G of free space. It worked before I tried to create a catalog. I have restarted already. What next?