Troubleshooting a PC Installation (MATLAB Installation Guide for PC) MATLAB Installation Guide for PC     Troubleshooting an Installation That Uses Dongles If your MATLAB installation requires the use of dongles, it can potentially run into conflicts with other applications you may be running that also use dongles. A dongle is a hardware-based security device that attaches to the serial or parallel printer port of a desktop computer. It uses embedded codes and passwords to control access to software applications. MATLAB requires a certain set of dongle drivers. You cannot use other dongles with MATLAB. Also, if you remove other applications from your computer, these applications may delete the MATLAB dongle drivers as well as their own. To help troubleshoot problems with dongles, MATLAB includes a utility program call dongleutil.exe. The dongle utility program can be used to: Determine the version of the currently installed dongle drivers. This information is useful to the MathWorks Technical Support. Specify the version of the dongle drivers required by MATLAB. Install the dongle drivers required by MATLAB. If an installation uses dongles, the installer includes the dongleutil.exe utility in the $MATLAB\bin\win32 directory, where $MATLAB represents your MATLAB installation directory.  License Manager Error Messages MATLAB Directory Structure