The most important information for now would be the debug log. In case of a hard crash like this the best way is to start from a command prompt with the -d parameter as rdswift said. I described the process a bit more detailed at Musicbrainz Picard 2.1 crashes while saving the 5th song
Windows command prompt can sometimes be a bit tricky to copy paste from. Best would be the complete log, but in any case include the very end of the log just before the crash. Usually theré should be some useful error output there.