You told us the problem but didn't give enough info.

What program are you using to do the playback?

What driver is being used by that program?

Are the files waves, MP3s, or are they being played in a multitrack format?

If multitrack.... what player?

Do the multitrack files contain audio and midi or just one of those exclusively?

That's a good start to helping you figure it out. Often, there can be stuttering and playback issues like you described in the multitrack world due to driver issues. Normally, a computer is able to handle single mp3 and waves just fine.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.