Windows Defender win8 off open Solution

Recently, the small series pre-installed Windows 8 model notebook, under the Metro interface click Windows Defender Software tips:

"Windows Defender is turned off and your computer is not being monitored."

Unable to open Windows Defender, how do I handle it? The following figure:

Reason Analysis:

Windows Defender is a Microsoft-led antivirus anti-spyware that has other anti-virus software installed on our machines such as:

Mcafee,360, Jinshan, Kaspersky and other third-party anti-virus software, Windows defender automatically disabled.

Solution:

Take y400/y500 as an example:

The anti-virus software pre-installed on this model is McAfee.

Step one: Uninstall McAfee in the Control Panel, as shown in the following figure:

Step two: After restarting the machine according to the prompts, enter Control Panel, system security, Operation Center, security, click "Activate Now"

Windows Defender. When enabled, the Update Now button appears, and Windows Defender is turned on normally:

The following figure:

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