I am running Windows Vista Home Premium 64-bit SP2. Something regarding Windows Defender happened out of the blue recently, with a System Tray Icon and Message: "Windows has blocked some startup programs" ... I fiddled around with the options presented through this icon, including opening Windows Defender Software Explorer and Microsoft SpyNet services. In mucking around with these settings, I recall vaguely a message in there about a new 'certificate' needing to be created.
Subsequent to this, I have lost the ability to visit most secure websites. Attempting to go to https://www.pairnic.com/ for example just leads to a "Page cannot be displayed" error page. I believe this to be a problem, perhaps, with a root certificate or other certificate authority problem (something I know very little about). I have many many certificates listed in Tools > Internet Options > Content > Certificates, though! So confusing!
If you type a reply in this thread, I pray you will present your answers, thought, or solutions as though they were written in the 'For Dummies' book series.
I read another thread on DaniWeb with a similar problem, but the last post was back in 2006 or so and it was deemed "SOLVED," although I saw no clear answer and the suggestions put forth were rather Brownian and flailing ... MTUs, reset Internet Options (Advanced and Security Tabs) to defaults, etc ... with no clear resolution. Again, I believe the problem to rest in the certificate area.
How can I install a new root certificate? Where do I get one? Which one is the best to get? Please help! Thank you :)