Well, it sounds like those are what you'll need....
Now, I can't guarantee this will work......(that's the fine print)
Go to the control panel, system, device manager, find the com port we're talking about and for right now, place a check mark in the box that says to disable in this hardware profile....
Restart the computer and take a look to see if by some lucky chance, things moved around......
If not, then remove the modem and the sound, reboot and let windows find new hardware......I think I'd let it find the modem first.....so if it finds the sound first, try to cancel that.....the modem should be happy on 4.....but you can never tell......then reboot again and allow it to find the sound.
You may be prompted for the modem, sound, and/or windows installation cds......