Can't open a website when URL has "secure" before it.

The login page for their site is at https://secure.bhg.com/ with https and a dot between secure and bhg.

The ‘secure’ part in the address name is nothing special (naming it secure doesn’t make it secure; there’s more to it). They could have called it ‘foo’ with the same functionality, although the former describes it better. 🙂

Have you tried deleting the cookie again?

Try setting up another admin user account to see if the same problem continues. Also try the Safe Mode.

Isolating an issue by using another user account

Safe Mode - About

Safe Mode Startup – El Capitan. also Sierra

If it works in the Safe Mode, try running this program when booted normally and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read. Click “Share Report” button in the toolbar, select “Copy to Clipboard” and then paste into a reply. This will show what is running on your computer. No personal information is shown.

Etrecheck – System Information