If it moves when it should, but does not move enough it is most likely slack in the regulator cable or less likely play in the motor mechanism. There's some threads about it and some people have used bicycle cable adjusters to take the slack out.
I'd pull the door panel off and get a look at exactly what's happening before buying parts.
http://986forum.com/forums/boxster-general-discussions/25704-window-regulator-permanent-fix-stretched-cable-4.html
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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