I only want to hear the sample only as long as I press the key. After I realease the key I do not want to hear any further sound. If any one can help me make the proper adjustments, I'd appreciate it thank you.

You'll have to go in and edit the voice so that it has no "Release" stage. It is the Release in an ADSR envelope that determines how the sound tails off after key off.

Check some of the links on the Midi & Synth Info page here at Synth Zone which provide good background information on programming synths/samplers.