Unity 5.3.2f has no diffuse material and the shader is not working.

Unity version 5.3.2f is not working for me. Everytime I create a new project or load an old one eveything becomes pink. I always get the same error message as the one shown in the picture and there are some strange boxes in various places in the editor. The boxes change color every time I click somewhere in the editor. I have tried clearing the cache through “Edit >> Preferences >> GI Cache >> Clean Cache” but it only gives me the message “Cache settings can’t be changed while lightmapping is being computed.”
Anything I import instantly turns pink no matter if I apply a custom texture or not. When I load the standard assets I get 36 error messages and once again everything is pink. I have tried reinstalling unity 3 times now but I always get the same result as the picture shown.

Please help, I have searched through alot of unity forums and found alot of similar problems with shaders and the default material but none of the solutions they offered worked.Imgur: The magic of the Internet

Hi dude - did you have any luck fixing this?