First off, the people in this forum are the most helpful anywhere!

I have a 98 C230 and the power windows have never worked (since I have owned the car) in the position where the button is depressed fully to have the windows open or close all the way without holding the button. They do each function open and closed but only if you hold the button at the first detent. If depressed fully, they stop moving.

I know this is something stupid, but if it is just a relay or something, it would be worth fixing.