Did you try updating to the latest version of Lightroom? Currently 5.5.
RikkFlohr did do that one actually, sorry wasn't paying attention that it was different.
Also, I looked in Premiere Pro CC, and it has both of these in it: msvcp100.dll and msvcr100.dll. I went ahead and copied those to Lightroom's folder, just to see if that would fix, but it didn't.
I am going to try the 32-bit version just to see it that works or not. I don't know why it would or would not for another reason.
32-bit works completely fine. Do you know of any way to get the 64-bit version working again, that involves the 32-bit working and not the 64? I am 64-bit Windows 8
Sorry for all of the posts, however it suddenly stopped working, again.
I closed it (32-bit, Lightroom 5.5), after it worked fine. After opening it again, it came up with the same error...