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Last modified: 2011-12-30 13:02:56 EET
All versions of Windows ship with Automatic Updates (aka Windows Update) enabled by default. In Windows XP, it is accessible via Tools or Safety menu of Internet Explorer; in Windows Vista and 7, Automatic Updates is located in Control Panel.
Windows Update automatically patches security holes (if set to do so) and therefore enhances your computer's security. It is strongly recommended to keep the feature turned on to stay safe online.
Non-Microsoft programs can be kept up-to-date with Secunia PSI.
You should ensure you have enough free disk space before installing updates - at least 1 gigabyte of available space is recommended. For Windows Service Packs, even more free space might be required.
If Windows Update constantly displays errors before or after checking for or installing updates, read the Repair Windows Update article for easy troubleshooting.
If Automatic Updates/Windows Update has been turned off for some reason and you would like to apply updates now, make sure you perform a full scan with products like avast! Free Antivirus or Microsoft Security Essentials first. Also scan for other malware with Spybot Search & Destroy and Malwarebytes' Anti-Malware to be sure that your PC is not infected.
Having a complete backup of your computer is also a good idea in case something goes really wrong.
In Windows XP, you can launch Windows Update by opening Start menu and clicking Control Panel.
If Control Panel is in Classic Mode, double-click Automatic Updates.
If Control Panel is in Category View, open Security Center and then click Automatic Updates.

In Windows Vista and 7, click Start button or press Ctrl+Esc on your keyboard and type the word update into Start menu Search box. Then click Windows Update.
If there are updates available, Windows Update icon will be displayed in Taskbar Notification Area. Click it to open Windows Update in Windows Vista or 7. In Windows XP, this will not open configuration options, though.
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Automatic Updates/Windows Update is now open. First let's select a good time for Automatic Updates.
While Microsoft publishes security and stability updates on second Tuesday of each month, there are times when patches for critical vulnerabilities are released outside the schedule. That's why you should set your computer to look for available updates every day.
In Windows XP, make sure you have the Automatic (recommended) option selected. Then select Every day and set the time when your PC is most probably turned on in the Automatically download recommended updates for my computer and install them combo boxes.
Click OK to close the window and apply changes.
In Windows Vista and 7, click the Change settings link on the left:
In the Choose how Windows can install updates window, make sure Install updates automatically (recommended) is selected. Then select Every day and set the time when your computer is most probably turned on in the Install new updates combo boxes.
Next, ensure that both Give me recommended updates the same way I receive important updates and Allow all users to install updates on this computer boxes are checked.
Finally, click OK. Do not close the Windows Update window yet!
In case you have already enabled Microsoft Update, there are two more combo boxes available - Give me updates for Microsoft products and check for new optional Microsoft software when I update Windows and Show me detailed notifications when new Microsoft software is available. Make sure both of the options are turned on. You can skip the rest of the article then.

Microsoft Update is like an add-on to Windows Update/Automatic Updates - it enables updating other Microsoft software such as Microsoft Office products, and installing free software such as Microsoft Security Essentials or Windows Live suites.
Click here to show or hide instructions for turning on Microsoft Update in Windows XPAgain, if you encounter problems with Windows Update, read the Repair Windows Update article.
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