|Anything else you can think of that could be using your webcam - chat programs for instance? One strong possibility is ASUS Smartlogon utility if you have that onboard.|
Did the camera work and then suddenly start doing this?
Are there are any errors at all showing in Device Manager?
These are worth a shot:
Install CCleaner Slim (free) and run it - it clears out uneccessary junk.
Install MalwareBytes Free and run it, just in case it is a Malware issue.
Always pop back and let us know the outcome - thanks