This morning I tried opening my AutoCAD (2013) file, which already contained a LOT of 3D models and I recieved the error message "Fatal Error: No More Memory - Shutting Down." Obviously as a result, I was unable to open the file. Upon attempting to open other AutoCAD 2013 files that I had saved, which did NOT contain 3D models, I recieved the same message. I then tried to open a brand new, blank .dwg CAD file and again, Fatal Error message. I told my CAD Detailing teacher today about the incident and she insisted that because multiple CAD files wouldn't open, the files were NOT corrupted but that it was an issue with my computer (using 64 bit version), to which I still am skeptical about. I cannot go into the file and delete all of the extra 3D models that took up so much space because the program will not open to begin with. Has anyone encountered this before or knows how to solve this problem? Or even if I cannot recover the 'corrupted' file, how can I make the program run normally again at this point?