Was this reply helpful? Yes No. Sorry this didn't help. Thanks for your feedback. I have windows 8 on my laptop and i have mcafee preinstalled now i have been uninstalled it and used mcafee removal tool and now i'd like to turn on windows defender, but everytime I click the windows defender icon, pop-up window appears and it says "windows defender has been turned off and isn't monitoring your computer.
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Click the Windows Security tab. This tab is on the left side of the window. It's in the middle of the window. You may have to expand the Windows Security window by clicking the square in the top-right corner of the window before proceeding.
You'll find this link in the middle of the menu. Click Yes when prompted. Doing so will turn back on Microsoft Defender. Method 2. Determine whether you intentionally installed an antivirus program. If you did install an antivirus program on purpose, you should know its name. If not, another program probably installed the antivirus software as part of its installation process, meaning you'll need to look for a program whose name you don't recognize.
Click Apps. It's in the middle of the Settings window. Sort by date if necessary. If you don't know the antivirus program's name, you can narrow it down by showing the most recently installed programs and working backward from there. To do so, click the "Sort by" menu, then click Install date in the drop-down menu. If you know the antivirus program's name, skip this step.
Find the antivirus program. Scroll through the list of installed apps until you find the program that you need to uninstall. If you didn't intentionally install an antivirus program, you'll probably find the program you need to uninstall near the top of the list of programs if your Windows Defender only recently turned off.
Click the program's name. Doing so expands the program's name to display an Uninstall button. Click Uninstall. You'll find this under the program's name. Click Uninstall when prompted. Doing so opens the program's uninstallation window. Follow the uninstallation prompts. Click through the on-screen uninstall prompts, making sure to select the "Delete all files" or similar option if asked whether you want to keep residual files and apps.
Delete other associated programs. Some antivirus programs install additional programs to handle things like web security; if you see other programs that come from the same developer or have similar names to the program you just uninstalled, uninstall them as well before proceeding.
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