Cubase cannot run because the software is corrupted

I just received the following error message: “The Software cannot run because it is corrupted. Please reinstall”

I uninstalled Cubase 8.5 and then reinstalled but I’m getting the same message when I try to open any of my projects. I changed the name of my Cubase folder in Program Files as I thought it might be an issue with preferences but still get the same message.

Can anyone shed any light on what this may be?

Running Windows 7

Is your system overclocked?