NAT forwarding error?

I have an Airport Extreme Base Station which I'm running with 3 pcs and a 12 inch powerbook - I used the powerbook to configure it. Everything works fine, except for 2 problems at specific online locations, which I suspect may be related. My online bridge club will not let me host a table because I have a "NAT forwarding error". I have read up and understand what that is, but the instructions I can find to fix it aren't very clear - can anyone give me better ones? The instructions I do have say I will have to set up a static address for each computer - my ISP requires a dynamic address. Is there a way round this? Also, the customer service page at my ISP's web site won't load - I get an Internal Service Error 500 message. Tech support at the ISP told me that "sometimes routers act like firewalls" and had me plug the modem directly into my computer - it then worked. Apple tech support said they'd never heard of such a thing. Could this also be a NAT forwarding error?
Power Book G4, Airport extreme, 3 PCs Mac OS X (10.4.6) Windows XP on the PCS
Dell Latitude CPx Windows XP Pro

The instructions I do have say I will have to set up a static address for each computer - my ISP requires a dynamic address. Is there a way round this?
The AirPort Extreme base station (AEBS) will continue to get it's address from your ISP via DHCP. You will need to give your computer a local static IP address. You will find the information you need in Steve Newstrum's user tip "How do I use Port Mapping (Part I)".

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Edit 1 May 2015: Added inbound
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Message was edited by: Eng Swee Yeoh

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