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[guesst]

Everything looks in order. I think I see the problem. You've never used DOS before have you?

For your arkanoid game you'll want to put the disk in the drive and turn the computer on, or off and on, or hit crtl-alt-del, either way.

If you have never used DOS before just let us know. I may be up for typing up a DOS primer to help you out, but I'm not going to do it if you do know DOS.