Windows 10: Windows 10 windows defender not turning on, no other anti-virus installed

I recently upgraded to windows 10. previously i was running windows 7 and using MSE microsoft security essentials but after the update it no longer appeared in my program files or the uninstall list. So I looked online and found that it doesn't work with windows 10 and window defender comes naturally with 10.

I tried to turn it on using various methods and get messages ranging from not having permissions, to "windows can't access specified device or file", to "this app has been turned off and isn't monitoring your computer" when i try to turn it on in security and maintenance nothing pops up but also nothing happens.

I looked online again I've yet to see anyone else having this particular problem most of the topics are from windows 8. but a few said "Windows defender won't come on while another anti-virus is on. I thought of security essentials back from windows 7 and found the old files are still here just relegaded to windows.old after the upgrade. I didn't touch them.

finally i was able to get it turned on using the command prompt but after installing updates and restarting the computer it's once more offline and i'm once more unable to turn it on by normal means. what's going on and how do i turn it on so it stays on?

:)

 

Anti Virus Problems

You should not be using more than one anti-vrus program on your computer. Read the
IMPORTANT NOTE about not using more than one anti-virus program in this

topic.

The inability to turn on Windows Defender 8/10 is typically the result of having a third-party anti-virus installed or failure to remove it properly (completely). Since Windows 8/10 Defender includes anti-virus protection, it is
disabled during the installation of another anti-virus program. If a trial anti-virus (i.e. McAfee, Norton, etc) came
preinstalled on your computer or you installed one, Windows Defender will be turned off (disabled). Windows Defender recognizes the install and automatically disables itself when other anti-virus products are used
to avoid conflicts. Windows Defender will remain disabled until that anti-virus software has been completely uninstalled. In some cases, you may need to download and run the anti-virus vendor's clean up tool to remove any remaining
remnants.

• Replacing your Anti-virus - List of Antivirus Uninstallers and Removal Tools
• Microsoft Wiki: List of anti-malware product removal tools by Stephen Boots,
  MVP

After removal of the third party anti-virus, Windows 8/10 Defender needs to be
activated if you choose to use it. When uninstalling the third-party anti-virus Defender should automatically turn itself on but sometimes you may receive a message indicating
your system has no protection...click here to turn on Windows Defender. If not, and Defender remains disabled, you will need to manually turn it on.

• How to turn Windows Defender On or Off in Windows 10
• How to turn Windows Defender On or Off in Windows 8

 

How to turn on Window Defender virus protection.

I installed Malwarebytes Anti-Malware. Now my Windows Defender is turned off. I need the virus protection but am unable to turn on Defender virus protection. I am using Windows 10. Any suggestions?

 

How to scan anti-virus with windows Defender?

For windows 10, I would like to know on how to scan anti-virus with windows Defender, when I select a file and right click, there is no anti-virus for scanning for windows defender and how to make windows defender update automatically?

Does anyone have any suggestions?

Thanks in advance for any suggestions