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I am using Windows 7. In chrome, a lot of websites are not opening. An error shows when I start browsing a website, Screenshot.

Attackers might be trying to steal your information from idioms.thefreedictionary.com (for example, passwords, messages, or credit cards). Learn more NET::ERR_CERT_AUTHORITY_INVALID

The same website is opening in Mozilla firefox.

Here is the snapshot 1 , 2 , 3 , 4

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As I can see, the scale of this issue is occurring on the entire of your Windows 7 computer (happening on all web browsers), but it doesn't occur on your laptop (on the same network).

For this reason, I can jump into a conclusion, that is something goes wrong on your Windows 7 computer.

There are a few things you need to check, according to this guide, such as:

  • Make sure the date and time of your Windows 7 PC are correct.
  • Is there any antivirus software on your computer. Let's temporarily turn it off and check again those web browsers. Sometimes, the HTTPS filter/scanner feature blocks HTTPS connections and cause this issue.
  • Flush the DNS cache in Windows with the ipconfig /flushdns command. There are maybe a few outdated DNS entries on your computer.

Get back to me the result so I can help further.

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