I'm not sure about that machine, but for cardio walking is a low impact option and swimming is a no impact option that you may want to consider. For strength training, this article offers some suggestions: www.sparkpeople.com/resource/fitness_artic
If you continue to have trouble with your knee(s) though, it would be a good idea to see a doctor and possibly get a referral to a physical therapist so they can work specifically with you and give you a safe program to follow.
"Obstacles don't have to stop you. If you run into a wall, don't turn around and give up. Figure out how to climb it, go through it, or work around it." - Michael Jordan
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