Asus X59sl Webcam Camera Cannot Be Seen, Even In The Device Manager

Sorry for making an error in questioning in the last post; after reading it, I discovered the error right from the caption. Hence, permit me to retake it. My machine is a gift from a cousin who resides in France. He unistalled the original OS (Vista 32bit) and installed Windows 7. However, he told me he was not using the webcam because (as he said) Windows 7 hadn't its drivers. So, of late, since I very much cherished using the camera, I changed it back to Vista. Unfortunately, uptil date, I cannot see the Webcam Camera, even in the device manager to obtain its PID Number. (There is no sub: IMAGING DEVICE) from which it could have been obtained. I wrote back to my cousin and he told me it was there and used to work very well. Hence, at least, I know that it exists. But now, there are just no indications for its existence. Also, the piece of paper on which is imprinted its S/N, etc and pasted at the bottom of the machine is also completely wiped off. Hence, I am blocked. Could you, tell me how to go about it?