I'm not sure why you are being prompted to 'reinstall' LW.

When you install LW, it selects a 'default' folder for your downloads (somewhere in program files...limewire...)

You can choose where your downloaded files go by doing this:

Click tools...options...saving

Browse for your music folder.

Also, when you first download with LW after installing, it will ask you whether you want to download files that do not come with license information.

If you are okay with downloading copywrited material without a license, do this:

Click tools...options...searching

Uncheck 'show license warning'

Good Luck!