How to Reinstall Windows Defender on Vista

Windows Defender is a feature that Microsoft introduced into Windows with the advent of Windows Vista. It is a service which provides some basic security protection, including all kinds of security threats and pop-ups on the Internet. The software is included and automatically enabled with Windows Vista, however, some people have uninstalled it because they initially thought it was too annoying.

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Reinstall Windows Defender

Step

Turn on your computer and click the “Start” button.

Step

Click “Internet Explorer.”

Step

Type the following into the “Address bar” for “Internet Explorer": http://www.Microsoft.com/athome/security/spyware/software

Step

Click “Get it now.”

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Click “Download.” Internet Explorer will ask you if you want to run or save the program. Click “Run.” Wait for the software to finish downloading.

Step

You will be asked if you want to run this software. Click “Run.” Follow the on-screen prompts to complete installation of Windows Defender. When it finishes installing, click "Finish."

Step

Reboot your computer. Windows Defender will now be running.