Why has Microsoft disabled the functions to disable WDNISSvc, and MsMpEng.exe. ?

Why is there no options to uninstall defender?

Original Title: Defender Service

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Thank you for trying Windows 10 Technical Preview.

Windows 10 Technical Preview is still in the development stage and it uses your feedback greatly for the first question about WDNISSvc and MsMpEng.exe you can provide your feedback.

To answer your second question:

Windows Defender cannot be uninstalled, it can be turned off, because it is merged with the Operating system.

To turn it off follow the below suggestions:

  • Open Windows Defender.
  • Select settings tab.
  • Uncheck Turn on real time protection.

Note: This will only disable Windows Defender.

When you disable Antivirus:

Important Note: Antivirus 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.

Hope this information helps, for further assistance please reply.