http://www.soft29.com/converter/ogv-converter.html I believe is one I've tried to use in the past, realplayer has a free download you can try and they convert files into a ton of crap haha. If you just google or yahoo or someting .ogv file converter you should get some pretty good results but I think that one should work just fine.
You can use Xilisoft Video converter ultimate for that because that program have all the convert format for video and audio.
So interesting,but i prefer use Macvide VideoFlash Converter.It's prog can convert many different formats.Try.
To convert OGV files, type OGV Converter- Easily Convert OGV to AVI,MP4,WMV,MPEG,and FLV in Google to find the solution. Good luck.
Google is magic. Just Google Search at:How to Convert OGV to AVI, Convert OGV to MP4, WMV, MPGE, FLV, MKV and more on Windows/Mac? You'll find what you are looking for.