Intel 2100 DSL Modem - why so ficle

Can't get my subject modem to work...
Its internal and I hooked it up like the manual said but....
The computer recognizes the drivers but says there is no modem????
The modem is set in place good and it recognizes the modem during the instalation of the software but when it reboots, it tells me no modem.
Am I the retarded one or my computer.
Any tips from the masses?

Thanks
Dan