One of the things applying valid updates does is fix security holes that viruses use to infect your computing device. To protect you from viruses, it is critical to apply updates in a timely manner.
iPhone: Go to Settings->General->Software Update. This will check to see if you are up to date. You also need to update any Apps you have installed on your iPhone. Go to App Store. Click on Updates (lower right corner of the screen).
IPad: Use the same directions as the iPhone.
Windows XP: Go to Start->All Programs-> Windows Update. Once the screen opens in the Internet Explorer browser window, select Custom. If you have not done this for a while, it can take an hour or more to complete the search for updates. Once the list of updates comes back, select them all. Reboot your computer and go through the same search/selection/reboot process again and again until you do not find any more updates. You should go through this process weekly.
Vista and Windows 7: Select the Start button and click on Windows Update. Select Check for Windows Updates. Select all the updates presented, including the optional ones. Reboot as required and go through the process repeatedly until no more updates are found. You should go through this process weekly.
Applications on a Windows Computer: Applications such as Adobe Reader will have a Check for Updates option under Tools or Help. Follow the directions.
Apple OS: Click on the Apple Icon and select Software Update. Follow the directions. You should go through this process weekly.
Microsoft Office on Apple OS Platform: When any Office Application is loaded, click on Help and then Check for Updates. Follow the directions.
Apps Store Applications on an Apple Computer: Click on the App Store icon. Once the App Store has loaded, click on Updates (icon is on the top far right side). If an update is available, click Update to download and install it.
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