To convert your mp3s to wavs use MusicMatch. Go to File > Convert. You can change your mp3 to a wav file in this options box. It may take a couple of seconds to complete.

By default, your mp3 music files go to:
C:\Program Files\LimeWire\x.x\Shared
Replace the "x.x" with the approriate version number (eg. 2.0).

If your songs have glitches, you may have downloaded a faulty song. But if your computer is slower or you are doing a lot of other things, the song may skip. Also, defragmenting your hard drive improves performance.

Merry Christmas!
:-)