Yeah sounds like an irq conflict.
IRQ is like a pipeline to your processor, my laptop had my WiFi internet card, ultralite mk3 and graphics card all on IRQ 16 and I had occasional blue screens and drop outs/squeeks/pops. To check your IRQ settings open your device manager and right click on device manager and select 'view->resources by connection' expand 'Interupt Request (IRQ)' and have a look.
You can't easily change the IRQ settings of a computer with ACPI (Windows defaults to this, allows for plug and play to work)
To fix this I reinstalled XP SP3 and only installed the necessary drivers, no internet! And now it works fine.
Another way to get around this problem is to buy an express card like:
http://www.bhphotovideo.com/c/product/4 ... nsion.html as your express card slot should hopefully default to an IRQ with not much else on it.
Or as a last resort you can uninstall the ACPI drivers and install standard PC drivers which would allow you to specify device IRQ numbers, I've never tried it and I don't recommend it but I thought I'd mention it for anyone who has no options left.
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