Hi and thanks for helping me with this.
So the files I want to add are like this:

I have downloaded a lame encoder and it is in the codecs area of the programme and is live. Here is a screenshot:

Every time i highlight the files I want to convert to mp3, I get this screen:

The player properties look like this:

I did adjust them but I think I reverted back to the original settings when nothing worked.
Does this help at all?
Thanks again, much appreciated.
It looks like my screenshots have not been added from mediafire. - it is just not my day today!!