Midi Output

I am having trouble getting any sound. I don't have a midi keyboard anymore, so I am trying to use the midi card from my computer. When I open the program it says I have "No midi outputs selected". Then when I go to "midi devices" or "instruments" from the options menu, it doesn't give me a choice for an output. I have used Anvil studio and Quartz audio, so I know I have a midi port, so could someone help me to get sound from Cakewalk? I have a Dell Dimension if that is any help(Cakewalk worked on my Compaq)
Thanks In Advance.