question: add menu etc.. to existing dvd

[Casual28]

this is the problem:

i have some movies on dvd, who don't have a menu or anything.

i would like to add a menu to these movies and burn them again, but i can't seem to find a program that recognises the format.

so far i've tried windows movie maker and pinnacle, but they don't recognise any of the files so i can't import them.

could you please help me on this?

thanks in advance