Welcome to the forum and hopefully your OASIS IS FOUND.
We can be very helpful here and do not easily give up on problem solving.
The MIDI interface you purchased over the internet may be a device like the one I
recently purchased, which was a Hong Kong knock off and faulty manufactured.
The MIDI cables were wired in reverse and the Input side to the PC had so much
noise on channel 1 it was unusable.
As Michael has stated we need to know which model keyboard you have and a
bit more detail about your PC. If you do not have a Yamaha keyboard, we may still
be able to help if you can tell us more about the keyboard you do have.
As to which area of the forum to post in, just post your questions in the MIDI Files and Setup section.