Alright. Do a file search on your harddrive. Search for "firewall" and if you find nothing from there, search for "fire".

If you find it, describe to us what the settings are and we'll try to walk you through opening the port.

Also, if you still have it, look at the instructions manual for your router, or at the very least, figure out the model number and then download the manual from your router's manufacturer's website.