VirtualBox log files is one of the great tools to diagnose an issue in your VirtualBox. It will always create a log file which reflects the lifecycle of your virtual machine. VirtualBox log files is located in user/per-vm directory. Depending on the OS: On Windows, %HOMEDRIVE%%HOMEPATH%\.VirtualBox\Machines\\Logs E.g. C:\Documents and Settings\Username\.VirtualBox\Machines\\Logs\vbox. log On Mac OS X, this