In this short tutorial, let us learn how to turn Windows Vista Defender on. Follow the steps as shown below:

1) Click Start Menu and select "Control Panel" as shown in Figure 1.

Figure 1.

2) When "Control Panel" opens up select "Security" as shown in Figure 2.

3) When "Security" opens up click "Windows Defender" as shown in Figure 3.   Figure 3.  Click here to view larger image.   4) Now "Windows Defender" appears. Click "Options" under "Tools and Settings" as shown in Figure 4.     5) Now scroll down and in Administrator options check "Use Windows Defender" and click save button as shown in Figure 5.