Viva Mexico Cabrones

Hello Guys

I have a little problems
hopefull you can help me

I want to play my midi keybord with some Pd syntethizer but i can`t do it because the sound have a digital distorsion or something like that

i think...the problem is the asio driver but i'm not shure

is there any patch to fix this ?............

I'm experiment with the Pluto synth from the obiwannabe site

is there any person playing in real time with a PD SYNTH?

I don`t have this problem with other Vst instruments

MY hardware

Acer 5520
Windows XP
2G RAM
AMD turion 64x2
Alesis Photon X25(Midi Keybord And Audio Interface)

Thanks