Hey, use Super video converter, its the best. It converts anything to anything in very little time
http://www.erightsoft.com/SUPER.html
its a little hard to find where to download Super. go to the link, scroll down to very bottom, and click, start downloading Super, it will take u to another page, scroll down a little bit until you see "SUPER © is a FREE Multimedia software to download and use" click download and use. then scroll down to very bottom and there is the download page.
You can also try Encode360. it works great too, and both are free.