There are many other free converters you can try if you suspect that one isn't working.
Another one here, although I am not vouching for it, read and decide for yourself if you want to try it or not
http://download.cnet.com/Free-Audio-Converter/3000-2140_4-10893961.html
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
Please select the post that helped you best and mark as the solution. This helps other members in resolving their issues faster. Thank you.
