Windows 10: I recently encountered a Microsoft support ad scam. How do I make sure I haven't been affected?

Hello,Recently, as I was browsing the internet, my browser suddenly sent me to a suspicious site with a bunch of popups saying that my PC was infected and to click here or call a number to get help. I did not click on anything and left the site as soon as I possibly could, but now I'm worried about whether I may have been infected or not with something. I did not notice any downloads on my browser and I scanned with Windows security and Malwarebytes as soon as I could, but I noticed that my full scan with Windows, which was the first one I've done on my PC, was running super slow as expected,

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Not sure if it was a scam

Yes. You're right. That's a scam.

You might want to look at
https://blog.malwarebytes.com/tech-support-scams/:

Also:
www.microsoft.com/reportascam

• Beware of Phony Tech Support Scams
• https://blogs.microsoft.com/on-the-issues/2018/11/29/new-breakthroughs-in-combatting-tech-support-scams/
• Protect yourself from tech support scams
  

 

Microsoft Technician Scams

Some related and official Microsoft articles:

• Protect yourself from tech support scams
  
• Tech support scams
  
• www.microsoft.com/reportascam
  

Other non-Microsoft, but very good articles worth reading:

• | Malwarebytes Labs:
• Beware of Phony Tech Support Scams

 

Microsoft support scams

Yes. That's a scam.

Microsoft doesn't call you if you didn't ask them to call you.

Do not trust unsolicited calls. Do not provide any personal information.

Please read:

• Beware of Phony Tech Support Scams
• Avoid scams that use the Microsoft name fraudulently
• Tech Support Scams – Help & Resource Page
• Tell Your Relatives: No,
  Microsoft Won’t Call You About Your Computer
• The “Tech Support”
  Scammers Called HTG (So We Had Fun with Them)
• http://support.microsoft.com/reportascam

And watch:

Fake Tech Support Scams – video from the MS Digital Crimes Unit