Moving this discussion to the Photoshop Lightroom forum.
Feverstockphoto do you receive any specific error messages when you try to open Photoshop Lightroom?
No error messages, nothing.
I have since reverted back to a cloned image of my system from a few weeks ago and downloaded again seperately. Now it works.
Although installed cc 2014 two errors on that, something about C++........
Feverstockphoto if it referring to Visual C++ redistributable then you will want to reinstall the appropriate version from Microsoft's web site.