Installing the latest version of Camera Raw isn't going to affect Lightroom at all. The raw technology is part of the Lightroom program, and Lightroom has to be updated in order to have that updated. If you reinstalled Lightroom from the CD then you only have Lightroom 6.0. The last update was 6.14, but those updates are difficult to find anymore. The link that I had doesn't seem to work, at least for me. So I don't give it out anymore. Is your camera really a Mark V, or is it a Mark IV?
Reading your question again, did you actually reinstall Lightroom? What is the actual version number installed on your computer? Did you install any updates to Lightroom 6?