Moving file failed ???

Basically whenever I click to start my game in unity a error pops up saying moving (temp file location) to ( back up scene file location) failed access is denied and the options it gives me are cancel force quit and try again when I click try again it just pops up again when I click force quit well it force quits when I click cancel it temporarily wipes unity shows a blank scene in the inspector and says no cameras available please help me this is a very important program and I need it to work and ideas??? :3

I fixed it I gave my files admin privaleges after updating my PC and they worked thanks to all who helped me @Xavier78 especially!!!