Cakewalk Install Trouble

[maqic]

i just bought a copy of cakewalk XL home studio.... I installed it but everytime that I open it, a windows pops up giving me some kind of error saying that I need MIDI or something.. can anyone give me some information?? i can't use it..

[brzilian]

It is probably the "No MIDI ports are selected" message. You can just click "continue anyways" button run it.