Windows Defender cannot open

Hello,
I've got a question about Windows defender: I have a brand new Thinkpad T440S (Windows 8.1 Pro) and
Windows Defender cannot open. There is a message saying: “This app has been turned off and isn’t monitoring your computer”. Impossible to turn it on”. When I try to launch it (R+service.mcs + windows defender), I still have this message: “Windows cannot verify the digital signature for this file. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.”
What should I do about this issue?
Thanks a lot for your answers/advice.
Solved!
Go to Solution.

Hello,
For Windows 8 (and later), Microsoft renamed its Microsoft Security Essentials anti-malware software to Windows Defender.  Which can be a bit confusing since Windows Defender was the name of the anti-spyware program Microsoft shipped for Windows 2000 through Windows 7, and worked alongside other anti-malware programs.
Windows Defender (the version for Windows 8 and newer) is a full anti-malware program and cannot be run in combination with other anti-malware programs such as those from Kaspersky, McAfee, Symantec and so forth.
Regards,
Aryeh Goretsky
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