Sounds like an IRQ conflict with your sound card and possibly your network card. Do you have built-in sound or an add-on card? If an add-on card, try going into your BIOS settings and manually setting the PCI slot your sound card is in to IRQ 5 (reserved for legacy device).
Shawn
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Shawn Sonnentag
Irix/Linux/Windows System Administrator
I disabled the sound in the BIOS and no lockups. I'm going to try a different modem next. I would try a different soundcard but i don't have any PCI ones.