The equipment I have is this:

Mbox
Yamaha MG12/4 mixer
Yamaha PSR-172 keyboard
Kawai FS-690 keyboard (for midi control) - decent keyboard for being old
Maxtor 80GB external Harddrive (USB)
USB Midisport 2x2
2 pairs of Sony MDR-V150 headphones (one for monitoring through mixer, one for Mbox)
M Audio C02 Digital Converter
KLH CDR-2000 Cd Player/Recorder
Naxa nx-982 dynamic microphone
Gateway M305X laptop computer w/512 ram, 2.40Ghz processor
ART X-11 Midi master controller

The question I have is this:

I keep getting the 9703 error whenever I want to play back more than two audio tracks. Right now I have three audio tracks and when I push play trying to play them all I get this error. Does anyone know how I can fix this? I have already defragmented my audio drive but I still get the problem. Please help. I'm working on a pretty good club track and want to get it finished. Thanks.

Big Trey