There might be some software problem if it happens only with Skype... Some hardware problem if it happens with other chat websites... I will suggest to replace your cam...
Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.
There might be some software problem if it happens only with Skype... Some hardware problem if it happens with other chat websites... I will suggest to replace your cam...
Try using Revo Uninstaller. Even if it can't uninstall the application normally, it will force it to uninstall by wiping out all traces of its presence from the system.
After that, try running AdwCleaner to make sure that there are no leftover rogue registry keys or toolbars in your system.