Hi all, on my windows 10 pro computer, there's been a problem with most websites showing up as having an invalid certificate, even trusted sites like cnet.com (not only website just an example). It says, your connection isn't private, and when I click on proceed anyway, I checked the certificate and it says that it's invalid. Some websites, it won't even let me click on proceed anyway (there's no option to), and says instead. "You cannot visit www.example.com right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later." This happens on all browsers. I think one of the causes for this is my dad's work applications. He has to use a vpn and stuff to remotely access his work desktop, and it messes up with the settings and whatnot. This problem was on my surface pro, which he also downloaded his work stuff for, and it was fixed after resetting windows completely. This isn't an option for me since I have too much important stuff on it. I tried to reinstall windows and I selected, "keep apps and files". No luck with that. Also made sure my time and stuff was correct. For these websites that I'm able to click on proceed anyway, the certificate is issued by "R3". The ones that don't give any warning don't say issued by R3 though.
The applications he used were Big IP F5 and Citrix reciever.