Is this the block image you are seeing?
Has your computer recently installed the Windows 10 'April 2018 Update' version, also known as Build 17134? You would know if it had installed, because you have to go through a question-answering process after it has installed. this latest windows update has caused problems for some RealSense users.
A user called StevenSpringtab recently offered an easy workaround to try.
Sorry, completely my fault, didn't know I had a typo, that was suppose to say black not block. But I did check the permissions, and they're all set to on, apart from contana and Win32WebViewHost, turned them on tried camera on Skype, and I saw an image for like a split second, turned up the exposer, and it seems to be working now. Thank you for your help.