Troubleshooting a PC Installation (MATLAB Installation Guide for PC) MATLAB Installation Guide for PC     Problems During Installation This sections provides answers to some problems commonly encountered during installation. Unable to Start the Installer: Missing Java Class File The installer requires the Microsoft Java Virtual Machine (JVM). When the installer starts, it checks to make sure you have the version of the JVM that it requires. If it detects that you do not have the version it needs, it prompts you to install it and exits. Sometimes, your system may have some of the correct JVM files but not all of them. In this case, the installer starts but displays this error message: Unable to start the application - the class file could not be loaded. To solve this problem, run the Microsoft JVM installer (msjavx86.exe) that is included with the MATLAB package in the \MSutils subdirectory of the toplevel CD directory. Invalid Personal License Password During installation, you must enter your PLP. If your PLP is invalid, you cannot continue with the installation. Check that: You entered your PLP in the Customer Information dialog box. Do not confuse your License Number with your PLP. A PLP is a series of 5-digit numbers, prefixed by a 2- or 3-digit release code, such as: 12-12345-12345-12345-12345 You have a current PLP. PLPs are version-specific. Do not use an old PLP with a new version of MATLAB. For information about troubleshooting License File issues, see License File. Failure Overwriting an Existing Toolbox Make sure to exit from any existing versions of MATLAB that may be running before attempting to run the installation procedure.  Troubleshooting a PC Installation Problems Starting MATLAB