I got a small trick that can really help in some dramatic situations. When you have a veg project that crashes during opening do the following:
1) change the name of your footage folder so Vegas won’t find the clips from the project
2) open your troublesome veg project
3) now Vegas can’t find missing clips. Ignore this and leave them offline
4) as you can see your project has just opened (but with all media offline of course)
5) open another Sony Vegas session
6) copy all clips from the original project to the new, empty project and save
7) close both Vegas sessions
8) change the name of your footage folder back to its original name
9) open the new project you created – now it opens with no problem
Hope this works for you because it saved my life many times.