Hmmm...not sure
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Have you tried using different LEDs and phototransistors? It could be a flawed component.
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You are aware that the range will only be a few millimeters?
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Have you mounted the components close together so that the light from the LED will be reflected into the phototransistor (when you place a white surface a few millimeters from it)?
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There is no "IR Transistor"!! There is an IR LED and a PHOTOtransistor. The latter should pick up the light from the 1st.
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Are you sure your cicuit is set up right.
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Are you sure you're reading from the right analog in?
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What is the reading when you DON'T cover it with your hand? Remember that it gives a LOW reading when light IS reflected and a HIGH reading when it isn't. Not the other way around as you may think..