Webcam not working in internet

Hello guys :) 1 month ago something happened and now I can not use my laptop camera in internet. To see if the problem is from the camera I've downloaded a virtual camera software like Manycam and still not working in internet. I've tried both ( the inbuilt cam and virtual cam ) in skype and they are working fine, but in websites like testmycam, omegle, chatroulette etc. the webcam is not working. What I've done so far :

Tried different browsers like Mozzila and Opera ( no success )
Uninstalled Adobe Flash and installed it again ( no success)
Downgraded Adobe Flash to random older version ( no success)

I'll be very happy if you can help me. Thanks in advance :)

Laptop: Asus N56VZ Windows 7