Jan,
Couple of things.

1. MIDI is just computer information, you need a synthesizer to reproduce the sound. The Creative card has several different options for the synthesizer, the onboard sounds, which are garbage, the SoundFont capability, which allows you to load SoundFont samples into the computer memory and play those back. Some of those are very good. Then, you may have 'Software Synthesizers' like the Roland VSC DXi or the Coyote Forte DXi, which will use any sound card.

2. You may also wish to use an external hardware synth, like the Ketron SD2. It's more expensive, but the sounds are much better.

3. Using Real Band, those files are already audio files.

Depending on what kind of synth you're using, you may not need to record them. Or you might.
Using the Creative Card or the Sound Font, yes, you can use what What U Hear to record those sounds to audio. In fact, you will need to find some way to output that information to record it. Another option would be to run cables from the output of the sound card into the input of the audio interface, but since this is a new computer, it's unlikely that you're going to be moving the card.
Next, if the new computer has a 32 bit operating system, you should be able to use the Software Synths, like the Roland VSC or Coyote Forte DXi (which I think works on 64 bit machines as well). Using those, within Band In A Box, or RealBand, you have the ability to 'render' those to an audiAo file. What that means is that computer takes the information present in the samples, and creates the audio file for you, without even having to play the song. For example, listen to the song below.

www.catsmeowcafe.com/Music/NiteTest2.WMA

This song was created using a Render feature in Band In A Box. I used the Coyote Forte DXi synth and Real Tracks. The piano melody was created using the Forte synth, and everything else was Real Tracks. Once I got what I wanted, I went to the Audio menu, selected Render MIDI to Stereo Wav file, etc. I was able to save the file name, and I was able to use the check boxes in there to make it render each instrument to a separate file track. By the way, it took me LONGER to find a halfway decent style for that song then it did to actually record and mix the song. Total time, start to finish, for this song was about 20 minutes! I, of course, already had the BIAB file for it.
Then, I went into RealBand, and I dragged those tracks from Windows Explorer right onto the track I wanted them on. Finally, from there, I opened up the mixer, and added some DX Effects, played with the mixing a bit, and did some Audio Editing on the trumpet track to lower the volume when the piano was playing.

While I *did* use a sound card, it was ONLY to listen to what I was doing. Using the Tascam, speakers and headphones I pointed out earlier in this thread would give you the same thing, and it would also let you listen. I did NOT use the 'What U Hear' or Stereo Wave Mix of the sound card, in fact, the sound card played NO FUNCTION at all in creating these files, only playing them back. But, you must have a DXi synth, like the Coyote Forte. That does work on 64 bit Operating Systems, by the way.

I hope this explains some of the ways that you can record internal synths without actually having to have a Creative Card in your new computer.

Gary

I'm blessed watching God do what He does best. I've had a few rough years, and I'm still not back to where I want to be, but I'm on the way and things are looking far better now than what they were!