I can't convert my videos

I'd installed the programme but it doesn't work.When I try to add some videos and then "start" the converting,it does nothing.
What am I supposed to do with it?

Originally Posted by Viple

I'd installed the programme but it doesn't work.When I try to add some videos and then "start" the converting,it does nothing.
What am I supposed to do with it?

I think you should be more specific if you want someone to answer you.
What program ? On which environment/system (Windows/Mac/Linux) ?