Has anyone else experienced this?

My O/Ced p4 computer does something very strange when rebooted. It detects a non-existant PCI modem. (the standard "new hardware has been detected" routine). The only device actually installed in a PCI slot is a Santa Cruz sound card. The problem is probably overclocking related, (p4 [email protected]) but the system is stable in prime95, memtest86, and sandra torture tests. Has anyone encountered anything like this before?
Thanks for all responses.

Do you have on-board modem plugged in and operable?

I`m using the onboard LAN. It`s a prpe mobo.

Sorry, P4PE

have you tried removing the sound card or putting it in a different slot? also, try to let windows install the phantom modem to see what happens. maybe it will give the non existant modem an irq...