Forgot you put the router model in your original post. The router should be left as a dynamic address, but you should set a static ip address on your pc so the ports are always forwarded to the correct ip. As long as you have those ports forwarded to your pc and your windows firewall is not blocking them, you should be able to host. Unless you have a software firewall (Norton, Zone Alarm, etc.) running, or if you ISP sent you a modem with routing capabilities (you would then need to forward the ports within their device also).