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 There are maybe a few outdated DNS entries on your computer.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.