Read some posts here, do a search, get some sense of what you need to ask in more detail, tell us a lot more about what programs you have, who your
audience is, all kinds of things. And yes 255MB is pretty big. How long is your video?
I have adobe premiere, I was using a trial of adobe after effects (but thats done now), I have like Archsoft Showbiz that came with my computer and Moviemaker of course. I am a college student and they have more programs on campus computers.
What would I need? Are there open source compressing programs?