Problem with sony handycam mini dvd

I have this problem. My friend was filming my birthday with a Sony handycam. Everything was ok. But when I tried to watch the videos in the morning cam only showed question marks and after few unsuccessful attempts it only showed that movie recording is disabled and dvd is full. It even doesn't let me finalize it and when I connect it to the computer, it shows no files, but all the dvd is full. Could you recommend me a software which could fix this problem? Or at least capture my videos? I would be very grateful for your answers.