If you are using an older operating system like Windows XP may encounter problems whilst trying to access some secure websites via https:// this is because older operating systems do not support modern forms of encryption and security.
Windows XP is 14+ years old and is no longer supported by Microsoft.
Upgrading your operating system to Windows 7, 8 or 10 will resolve this issue.
If you test the same website from a computer using a modern operating system you may find that the secure website you trying to visit works just fine however when visited from an out-dated operating system like Windows XP it fails to work, that problem may look like this:
Microsoft offers guidance on how to keep your computer's operating system up to date here: http://windows.microsoft.com/en-us/windows/updating-computer