Which version of LR?
Do you have any other programs open?
If so try closing them and just running LR.
If that makes no difference go to:
C:\Program Files\Adobe\Adobe Photoshop Lightroom 5.7
Then right-click on lightroom (the application) and choose “Run As Administrator” which often improves stability. Or if you have a desktop icon; right-click on that.
It is a problem with your computer. More than likely some type of memory failure. Hardware can fail at any time. One day/minute all is good, everything works, the next day/minute somethings don't work correctly or at all.
I have tried these suggestions and the same error occurs.