Has anyone experienced a pop-up "Microsoft Detected Security Error, Due to Suspicious Activity.

Hello welcome to the Community, 
 
 
SCAM!  Please do NOT call the number and do not click on any web links in that message.  Doing so will likely get you infected as that is what the scam is for: both to charge you money for 'services' and also plant malware onto your computer.
 
If you have any concerns that you may have malware on your computer that WSA has not detected, please submit a Trouble Ticket to have Webroot Support take a look.  This is a free service with your paid WSA license.

Hello baha323,
 
Welcome to the Community!
 
THIS IS A SCAM!!
 
Do not reply to this because Microsoft never issues this type of warning or email or anything of a sort!
 
Avoid tech support phone scams
Cybercriminals don't just send fraudulent email messages and set up fake websites. They might also call you on the telephone and claim to be from Microsoft. They might offer to help solve your computer problems or sell you a software license. Once they have access to your computer, they can do the following:

• Trick you into installing malicious software that could capture sensitive data, such as online banking user names and passwords. They might also then charge you to remove this software.
• Take control of your computer remotely and adjust settings to leave your computer vulnerable.
• Request credit card information so they can bill you for phony services.
• Direct you to fraudulent websites and ask you to enter credit card and other personal or financial information there.

Neither Microsoft nor our partners make unsolicited phone calls (also known as cold calls) to charge you for computer security or software fixes.
Telephone tech support scams: What you need to know
Cybercriminals often use publicly available phone directories so they might know your name and other personal information when they call you. They might even guess what operating system you're using.
Once they've gained your trust, they might ask for your user name and password or ask you to go to a website to install software that will let them access your computer to fix it. Once you do this, your computer and your personal information is vulnerable.
 
 
Best Regards,
 
 
 

Hi baha323
 
Welcome to the Community Forums.
 
May I just add to what David & Sherry have posted, the following snippet, from Microsft, that you may find of interest on the subject?
 
Regards, Baldrick