Software does not start. help?

i used the dvd fab premium trial and it worked fine. once i purchased a registration code and tried to start program it gets an error from windows. the error reads “DVDfab-Ultimate DVD copying/converting/burning software! has stopped working.” and “a problem caused the program to stop working correctly. windows will close the program and notify you if a solution is available.”
im using Windows Vista.

any suggestions would be greatly appreciated. thanks!

please follow the instructions for uninstall/reinstall and post back the results. <—