Excel Performance Issues and Errors when PC Usage is high

So, I finally think I have Excel's issues all figured out. I have been noticing when Excel starts using about 2-2.5gb of ram is where issues start occurring where Excel does all kinds of crazy stuff. I have a 16gb ram installed and one would think MS Office/Excel could easily run off of that. I have seen several posts in many other forums where users are finding the same issue at the same ram level. I am using Office 365 Apps for Enterprise 64-Bit. So, I should be able to utilize more than what it is limiting me too. I am on the most current version. So, after I completed an Online Repair I still get the Can't find project or library error when I open any file, even a blank brand new spreadsheet. My Reference Library is showing 2 Visual Basic For Applications checked one is pointed to Excel.exe and the other to the appropriate MSO.dll file. Since the one is connected to Excel.exe I can't remove it from the library. I do not want to do a full new install either. There has to be a way to access the reference library and remove this through the registry or something similar.