Since a few days ago - I believe it started after the Daylight Saving Time change - I can't open websites that use HTTPS connections, such as Yahoo, Facebook and Youtube, on Chrome or Mozilla Firefox. Internet Explorer opens them normally though, and I can also browse those sites on my tablet.
The message I get on Chrome is Your connection is not private, and Firefox says that This Connection is Untrusted:
I have checked my system time and date, and they are correct. I've also tried reinstalling both browsers and disabling my antivirus and some other programs, but that didn't change anything.
ipconfig /flushdn command on a Windows command prompt window fixed it for a while, but some hours later I started getting those errors again.