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Yes, it must be one of the largest items on my harddrive, at this rate and down the line it will require a computer just for this one piece of software?

And I can only play it through my pc speakers, my yamaha psr9000 causes the program to lock up if I set midis to Yamaha.



I'd say it's a good idea to consider an external USB drive in case you don't have one. They are quite cheap now, specially if you don't go the "maximum" gigabyte models. That's because the previous-to-the latest sizes are not attractive to install in new computers and the stock needs to be moved out, and so they sell them as USB drives with the usb cable and ready to plug and play. Therefore there are real bargains on USB drives daily on computer stores. The USB drive I used is the same one I had for external backups of my laptop disk drives; and external backups is one very advisable thing, anyway (for about $100 USA), even if later you buy a second computer.
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On the Yamaha locking up, one thing might be your interconnecting MIDI cable. If you are connecting with classic MIDI cables, you could try instead a MIDI-USB converter cable or box. My old Yamaha PSR-740 had that lockup untill I connected it with USB cable. By the way, the Yamaha MIDI sound modules in arrangers produce excellent sounds and zero latency practically, as such. You turn MIDI local off at the instrument, and check your clock signals as to who is clock master and who is not. You might even want none to be master.