Windows Defender win8 can not be closed under the solution

Recently, a small pre-installed Windows 8 notebook, click on the Windows Defender software under the Metro interface:

“Windows Defender is closed and will not monitor your computer.”

Unable to open Windows defender, how to deal with it? As shown below:

Cause analysis:

Windows defender is Microsoft's own anti-virus anti-spyware software, when other machines are installed on our machine Anti-virus software such as:

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

Solution:

to Y400/For example, Y500:

The anti-virus software preinstalled on this model is Mcafee.

Step 1: Uninstall Mcafee in the control panel, as shown below:

Step 2: According to the prompt After restarting the machine, go to “Control Panel"“System Security""Operation Center" "Security"Click “Enable Now”

Windows defender. When enabled, will display &ldquo ;Update now ” button, this Windows defender has been started normally:

as shown below: