What kind of modem do you have? If it falls into winmodem category - it'd be tough to configure it. So if it is a winmodem head to http://www.linmodems.org
to verify if there is a driver for your modem chip. As for CD-Rom and audio CD, are you trying to click on CD-rom icon to play CD? Or you use a CD-Player app to play CD's? The message given indicates that you've requested to mount CD-rom, but due to lack of filesystem audio CD's are not mountable.
Floppy? Try put the floppy into drive, open terminal console (Xterm for instance), type at the prompt
it will ask you for Password
type root's pass
and issue the following command
if there is no error message, do
t should show you the contents of the floppy.