|Don't make your system less secure. If it had worked before then you have no reason to change it.|
HTTPS uses a different port but the error you get is that the page is unsecure. Since it says that I can't be sure you are not being re-directed or the pages you want to go to are correct. It could be that you need to import certificates or you can't access them to authenticate the connection.
Might try firefox portable just to see if it can access the site.
Guess you could try a restore point to a time when it worked too.
I'd consider getting rid of the two products and get microsoft's security essentials. May better integrate with the OS and browser.
Why did it take me over a year to phone in a problem to ATT?