Windows 10: Cannot enable Microsoft Defender or the Security Center

Hello,I had an IT expert configure and optimize my computer a couple of days ago.I have now realized that one of his actions was to disable multiple services through "services.mcs".This he said was for faster startup and performance. However, I really wish to use Windows defender as my main malware protection service. Therefore I went to the services tab and tried to enable the services that I wanted online especially for this instance the "Microsoft Defender Antivirus Service, but got this message popped up in a new window;" Access denied"The Security Center service is also not possible to al

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windows defender & security center services keep turning off


Are you running any other AV or did you have one running in the past? If you didn't use an uninstaller for the AV, then the remnants of it could be causing the problem. Normally any time you install an AV it disables Defender by default.

If you are getting any error codes please list those, that will be helpful in helping you.

As torre suggested, might be a good idea to do a reset or even a reinstall.

Reset Windows 10 - Windows 10 Forums

Windows 10 - Clean Install - Windows 10 Forums

There are also some suggestions listed here:

Unable to turn on Windows Defender in Windows 7 / 8 / 10

 

Windows Defender/HP Solution Center

Hi,

It is possible that the Control folder access is enabled that is why its blocking the access to user folders when scanning with HP Solution Center. To resolve your issue, we suggest that you follow the steps in this
article to disable the allow a blocked app in Windows Defender Security Center.

Keep us posted if you need additional help.

 

Windows defender security center problem

When I try to start the windows defender security center the antimalware service executable starts up and uses up to 98% CPU. I have tried to change proxy restart defender and many suggested steps and also went to windows deffender online to do a scan
that way but no malware came up. The problem still persists. Does anyone know what to do in this situation? I just want my security to run properly but I cant even get to the menus.