Removing the usersave folder should be sufficient to clear the problem with the .mnux file. Your real problem is that there are many .ini files scattered araound the .../3dsMax/2014 - 64bit/* folders. Trying to find which one is causing the problem could be difficult.
There should be a .../3dsMax/2014 - 64bit/ENU/en-US/Network/Max.log. See if that gives you any clues.
If not, uninstall, remove the original installation folder, remove (or rename) .../3dsMax/2014 - 64bit then reinstall. Many of configuration files are not removed during an uninstall, neither are they overwritten during a reinstall so simply uninstalling then reinstalling will frequently not fix the problem.
If you're concerned about the license, use the LTU to export the license to Autodesk before uninstalling, then get it back (with the LTU) after you reinstall