Apple Software Update is an important program that updates computers running the Macintosh OS X operating system with the latest security updates.  Apple Software Update will scan your computer for any security issues and install the proper updates to fix it.  Running the Apple Software Update application on a regular basis is critical to protect your computer from the latest viruses, worms, and other malware. 

To run Apple Software Update follow the instructions below:

1. From the APPLE menu, click SOFTWARE UPDATE...
   
2. If you are running Mac OS X 10.3.x only: Click the CHECK NOW button.
3. Software Update checks for available updates.
   
4. In the Software Update window, select the items you want to install, then click INSTALL. You should install all available updates.
   
5. Enter an administrator account name and password when prompted. 
6. Software updates are downloading and installing.
   
7. After installation finished, click RESTART if required to reboot.
   
8. Your computer is now up-to-date.