Evening first time posting for me, but I might be able to help. This happened to me earlier,and what I did was reinstall Vegas 11 from the original Vegas 11 CD I had. It will run you to a few screens and then the Windows Wizard will let you know that there is a newer version of Vegas Pro 11 and asks you if you want to download the new version, click yes. Download the new version and you will be set. All my files were there.
PS…NewBlue Titler is stil crashing for me. I have to pull it to the timeline to use it not just double click it 8(