Uh… I don’t know how, but google chrome randomly opens pop-up ads every few minutes. I ran a complete antivirus scan, but no change.
If you’re still seeing unwanted pop-up ads, then your computer is infected with adware. It is a software that designed to display lots of annoying and unwanted ads. First open Add/Remove tool in Control panel, find and uninstall all unused, unknown and suspicious programs. Next, I recommend to download and run AdwCleaner and Malwarebytes Anti-malware. Both are free. Both are much better that Windows Defender (Microsoft Antivirus). Once finished, reset Chrome settings using Chrome Cleanup Tools. Also read and follow the instructions How to remove pop-up ads in Google Chrome.