In replying of other comments - My built-in Webcam (USB 2.0 UVC 0.3M) is integrated in Asus UL80Ag-A1 notebook. Everything with the Webcam driver is operational. also the Webcam is working using third party software like YouCam, for example. But was disabled after the latest Skype version (220.127.116.11) update. Upgrading to the next version (18.104.22.168) doesn't help, as well the driver's reloading?
With other words, since I did not find any Webcam pre-installed by Asus notebook manufacturer, and did not find any Windows 7 Home Premium edition Webcam software for testing, I install temporary YouCam and check that my built-in Webcam is operational (no software or hardware problems). It's Skype software problem disabling the video call somehow?
The Skype customer support suggestions how to resolve this problem did not help either? Any help suggestion appreciated. Thanks! Ken