Midi Doesn’t Sound Right In Sony Laptop?

I just bought a new laptop Sony VGN-SZ55GN but can’t play all my midi correctly.
SZ55GN Spec:
Windows Vista and SigmaTeL High Definition Audio CODEC
The strange things is when I played midi with Winamp Player the midi will played only the “bass” part like drum and percussion
If I played midi with Windows Media Player the midi will played only the “non bass” part other than drum and percussion
(as you guess, I can play the midi perfectly if I opened 2 of them together, but it troublesome ^^;)
I have tried another software as well, software to convert midi to sheet music like MidiNotate and Midiillustrator which usually plays all perfectly but now I only can hear the “bass” part.
I have tried to use earphone and it’s useless, same as above.
Am I having:
a. Plugins problem?
b. Driver problem?
c. Compatibility problem? (with Vista?)
d. Damaged SoundCard? (but mp3 works perfectly)
e. Software problem?
f. Broken Midi?
g. Hearing Impairment problem? definitely no!

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