There is no such thing as Lightroom 7
If you mean some other version of Lightroom, please quote the exact complete unedited word-for-word error message.
What is the version of Photoshop ?
Also I believe the Lightroom version would bre 6.3, Can you please confirm that.
The version I'm running is LR/Photoshop cc 2015 for photographers. I don't know how/why but PS got blown away and I had to down load it again. I'm able to go between LR and PS without a problem but it's running really slow. I often times leave LR open all day long. Could this have anything to do with the disappearance of PS?