I can't get window defender to turn on, my computer is new and came with windows 8 what up with that?

Hi Bender,

1. Are you getting any error message when you try to turn on the Windows defender?
2. Have you made any recent changes to the computer?

You cannot turn on the Windows Defender if you have installed any third party security software on your computer.

Method 1:

I suggest you to uninstall the Norton antivirus from control panel and then try to turn on the Windows Defender.

You can follow the link mentioned below to uninstall the Norton antivirus.

https://support.norton.com/sp/en/in/home/current/solutions/kb20080710133834EN_EndUserProfile_en_us

Security software can help protect your computer against viruses and other security threats. In most cases, you shouldn't disable your antivirus software. If you have to temporarily disable it to install other software, you should re-enable it as soon as you're done. If you're connected to the Internet or a network while your antivirus software is disabled, your computer is vulnerable to attacks.

Method 2:

Try the following method to Windows defender.

a. Press the ‘Windows + Q key on the keyboard.
b. Type “Windows Defender” in the search box and then press enter.
c. Click Settings and make sure there is a check mark on Turn on real time protection recommend.

Also refer

Windows Defender and Windows SmartScreen fight viruses and other malware

Please perform these recommended steps, review the additional information provided and post back if you are still experience the issue. I will be glad to provide you with additional options available that you can utilize to get this resolved.