How to change the format on a video?

i made a video on video impression 2 and like i tried to put it on youtube and it said it cant upload it coz its the wrong format and i dont know how to change it?? I have windows vista btw xHow to change the format on a video?There is a website you can use

www.zamzar.com

you upload it, put it in whatever format you want and put you e-mail and it will send it to you within 24hrs

its what i use, i hope it helps
How to change the format on a video?
use a converter.

http://www.dvdvideosoft.com/

that's the best one i've ever used.

it does all types of conversions and it's easy to use.
How to change the format on a video?
http://www.avs4you.com/AVS-Video-convert鈥?/a>
Download Youtubedownloader from www.youtubedownload.altervista.org ... This will allow you to convert the vidio into many different formats ... Hope this helps :) (it works with vista fine)
Use a converter

try

http://www.filehippo.com/download_any_vi鈥?/a>
You need to use a converter:

http://www.movavi.com/suite/howtos/how-t鈥?/a>