It is unlikely you have this problem, but when I bought my TE the front passenger window didn't work. After replacing the switch with no luck I wound up taking the door apart and finding that one of the arms the regulator had become wedged between the motor and another part of the regulator. Seems someone had taken the whole thing apart once before and left out a bushing that would've prevented that from happening.
Like I said, it is likely the switch or perhaps the motor (less likely), but before going and buying a new regulator be sure to exhaust all possibilities.

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Fourings

84 Audi Coupe GT with Turbo engine, EFI (buh-bye CIS), Jamex seats, Koni's/H&R's, e-code lights. 210k and counting.
1992 Anthracite 400E, 161k, "Grey Ghost".
1986 VW Quantum Syncro, 192k, gone to the crusher in the sky.
1989 300TE 172k. (Was mine, now also Mom's car)
72 280SE 4.5 (Mom's car)