Is there a way to force all members to register before they can view the forum? Do I have to go in to each and every forum and change the permission to where guest can't view it? Or can I just check something in the control panel that will force everyone to register before viewing the site?

Are you using 7.3?

If so try Control Panel / Group Management / Guests / Edit Permissions:Forum / Can See Forum - change each forum from 1 to 0.

Got it. Time consuming, but I got it.