Newly installed modem won’t work

I installed new modem–U.S Robotics Faxmodem PCI– in Win98-2nd Edition, when I check the modem properties in control panel/modem properties/more info, what I get is “error:the modem failed to respond…,verify that the interrupt for the port is properly set”, port=COM3, interrupt=5. In AOL, the modem was detected but when I’m about to select an area code, I get this “error: WAOL caused a general protection fault in module USER.EXE at 0011:00002075”. Please advice.

TYVM.