Nero wont burn (7.2.7.0)

I have i have been having a problem for a while now with nero and still i hav not had a solution so i was wondering if you guyz could help,What happens is when i put a movie on to burn with nero vison express whilst transcoding the screen just disappers.

Thank you for looking

Did you install 7.2.7.0 over the last version? If so, use Neros clean tool and delete it, make sure you save your serial number. Then reinstall Nero.

I formatted my hardrive yesterdya to see if that helps and then i reinstalled it it got to having bout 30 secs left and then just dissaperead