It almost seems like your cgi-bin doesn't have execute permissions from IIS

You have attempted to execute a CGI, ISAPI, or other executable program from a directory that does not allow programs to be executed.

Not to mention when I tried to register on your boards, It hops me to http://65.169.188.92/cgi-bin/ultimatebb.cgi?ubb=agree instead of driveradvocate.com.

I would fix your paths so that they all use the domain name. If you continue to get the 403.1, make sure your cgi-bin directory has execute permissions.

Worst case, you can fill out a support ticket

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Have you tried Everwars yet?