That depends on your BIOS settings, card slot positions, type modem (PCI/ISA).
1. If you can configure your BIOS settings to select IRQ's for card slots on your M/B, try that.
2. If your modem is PCI try moving it to a different card slot on your M/B (avoid PCI slot #1 if you have a AGP graphic card installed, AGP slot & PCI slot #1 are shares).
3. If your modem is ISA check your BIOS settings to see if you can configure Leagacy hardware to assigned IRQ's.
Not sure if this will help, because I don't know all the specifics of your configuration, hardware, and type BIOS. Another thing to check is for updates to your existing BIOS version. This may provide you some additional options of the BIOS settings. Hope this was helpful.
JC-------<*){{{>{~~~~~
Fisher of men