Help me please! - Control freeze

[zozo]

Hi pilots! (excuse my english...)

I build succesfull a PIC - serial interface was working wery well with an test PC at work but at home I have problems.
In calibrating menu al channels working well and also I can take-off and fly without problems but in every case after few seconds the control freeze, sometime short, sometime totally and the plane crash. Think today I discover the area of the problem because when I fly also listen music and when my controls freeze can't hear the music but the plane sound still hear. It is possible to have an conflict between my soundcard settings an serial port? I don't find trouble in Device Manager. My platform is an 2GHz Celeron with Win 98 and GeForce4 MMX 440 video card.
Please help me if you know solution

zozo