Hello Hugo
According notebook specification your T model was delivered with preinstalled Win7 64bit Professional. Original recovery image contains preinstalled webcamera software and it is set to start automatically so I would like to know since when you have noticed this problem.
I cannot imagine this problem persists from the day one. Am I right about that?
Do you still use original preinstalled OS?
By the way:
THIS is the right webcam driver for your notebook model.