Windows 10: Can I Scan With Window Defender Even I Have Already Installed 3rd Party Antivirus Software

If Yes, Can Both Of It Scan At The Same Time?

:)

 

Windows Security/Defender Turns off with 3rd Party Antivirus

Windows Defender will still update and allows periodic scanning with 3rd party AV installed. It's not totally disabled. This site explains it better than I can, Protect your PC with Windows Security alongside a third-party antivirus | Digital Citizen

 

Unable to install any 3rd Party Antivirus

Hi Gary,

Some antivirus features may cause conflicts with Windows Defender which can block the installation of your software. To fix the issue, you may try to turn off Windows Defender, and then install the third-party antivirus. To do so, follow the steps from this
link: Turn off Windows Defender Antivirus

Let us know if you have other concerns that we can assist you with.

 

Windows Security/Defender Turns off with 3rd Party Antivirus

These statements are widespread on the Web, but my experience is that Windows Defender doesn't need to slink off into the night when another protector shows up.

Some AVs work better than others alongside Windows Defender (WD). Malwarebytes Anti-Malware (MBAM) works happily with WD, so long as it's set correctly. And it's not hard to set MBAM so that WD is not only not crippled, but continues to offer real-time protection. They work just differently enough not to get in each other's way.

These images are from my main computer. I have the same pair (WD and MBAM Premium) running on three PCs.