Bug Fatal Error! Failed to get ipc connection from UnityShaderCompiler.exe shader compiler?

Fatal Error with no solution? I've reinstalled, checked for missing .dlls, searched the forums/other sites and found no solution - Unity runs fine on my laptop but after installing on my desktop for the first time this is what I get:




I can't even launch projects into safe mode from this. Older versions also give me this error.

Any help would be appreciated.