Ok now I am going to show you how to setup a DMZ for a dlink router.
Goto ->

->

->

.
Then Click on something that looks like this

Your router IP address should be found under Default Gateway.

Once you found that type the IP in to your Run bar. (go to start --> Run)
That will take you here.

Enter the IP then hit ok.
Now you will get taken to this page

Tpye in under user : Admin (not no password is required on defualt dlinks)
ok once you are here hit the advance tab

once you are there the side things will change and you will have to hit "DMZ" on the left side

Then hit apply and your almost done...Once its saves close the window.
Goto ->

->

->

hit the properties
and it should take you here
scroll down to your (TCP/IP) and hit properties for that and you should see somthing like this

ok do all that this says but were it says the ip 192.168.0.99 put the one you saw be for under
and then your done your ip will never change for your router and you will have your self open more to the internet..
-Special thanks to Dygear for the begining..
***Note to put back the firewall on do the same thing and disable that option.. enable opens you up.***