Cybertablet pen pressure problem

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Hi! I'm not new to Photoshop. I downloaded the trial version for CS5 because I wanted to try it out before buying it. My problem is that I can't get the pen pressure to work. I've tried everything from the settings in Photoshop and calling Adesso's company. I talked to one of their people and they recommended reinstalling my program for the tablet. It was fine, it works with GIMP but still refuses to work with CS5.
Any ideas would be appreciated!