Thanks. The problem was really the converter that was removing the tags. I tried to add the tag with EasyTag but somehow Im allowed to change the file. So I used another converter.
P.S.: for the record I used http://audio.online-convert.com/. I did not like the link you sent me at all. The installation tried to install WAY TOO MANY other softwares in my machine. That is why I hate freeware.