Installation Guide for pc

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• Get administrator privileges if you are installing MATLAB on Microsoft 
Windows NT or Windows 2000 systems.
Upgrade Installations
Always install MATLAB in a new installation directory, even for upgrade 
installations. The installer creates a new installation directory for each release 
by default, for example, 
MATLAB6p1
. You do not need to delete an existing 
MATLAB installation before installing R12.1. You can run multiple versions of 
MATLAB on the same system. 
Upgrading and MATLAB Preference Files
MATLAB stores your preference information, such as command history and 
help favorites, in preference files. The installer does not overwrite these 
preference files if they already exist on your system. Multiple MATLAB 
installations on the same system will use the same preference files. 
Note If you plan to remove your previous MATLAB installation, either before 
you install R12.1 or after running both versions on your system, you may want 
to save your MATLAB preference files. The uninstaller provided with earlier 
versions of MATLAB deletes these preferences files. See “Saving Your 
MATLAB Preferences” on page 1-21 for more information.
Standard Installation Checklist
This checklist summarizes the steps in the standard installation procedure. 
For a more detailed information about any of the steps, see its description in 
“Installation Instructions” on page 1-8.
Standard Installation Checklist
Perform the pre-installation tasks described in “Before You Install” on 
page 1-6
Step 1: Start the Installer
Step 2: Enter Your Personal License Password (PLP)

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1 
Standard PC Installation Procedure
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Installation Instructions
This section details each step of the installation process. If you encounter any 
trouble during installation, see Chapter 4, “Troubleshooting a PC Installation” 
for answers to some common installation problems.