I have a Dell Inspiron N411z laptop. The webcam worked fine initially, but when I started it in Yahoo Messenger, it displayed "No supported webcam". Now, it still shows "No supported webcam" even if I try to open it normally. I couldn't find the installation .exe file in the installation folder of Dell Webcam Center. On the Dell forum, they said that I need to uninstall-reinstall the webcam. What can I do?