Okay, do you have 2 separate problems?

Read this:

How to share folders

Just because the files on your hard drive won't play on the Limewire player doesn't mean that they are not being shared. They are simply playing on your default player (Windows Media Player).

Regarding your ?2nd problem...

Are you saying the music files you find using Limewire are different than the songs on your commercial CD? Okay...

There are 2 songs you want...what does this have to do with the files you already have? Do you mean you want to share these 2 files because they are different?

Good Luck

P.S. Please read this:

Writing a good thread