NAT with Cisco Router

Hi, I have a couple of questions, first I have a Cisco Soho 77 ADSL that I want to setup as a Web server in my PC. I have a cable connection and my ISP seems to block port 80, I tried a lot of stuff to setup my web server, I have a private IP, I know there is a Dynamic DNS service like http://www.tzo.com, http://www.dynu.com or http://www.no-ip.com, where I may not need a static IP address. With the Dynamic DNS service I can host a web site, email server, FTP server and more at my location even if I have a dynamic IP address.

This is my router Configuration.

Current configuration : 1118 bytes
!
version 12.2
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname Client_Name
!
enable secret 5 $$$$$$$$$$$$$$$$$.
!
mmi polling-interval 60
no mmi auto-configure
no mmi pvc
mmi snmp-timeout 180
ip subnet-zero
!
ip dhcp pool dsl1
network 192.168.25.0 255.255.255.0
default-router 192.168.25.1
domain-name intelnet.net.gt
dns-server 216.230.128.3 216.230.128.32
!
!
!
!
interface Ethernet0
no shut
ip address 192.168.25.1 255.255.255.0
ip nat inside
!
interface ATM0
no shut
description Cliente_No.de Serie_DSLAM_Puerto DSLAM_ TEL
ip address 10.28.1.30 255.255.255.252
ip nat outside
no atm ilmi-keepalive
pvc 0/32
protocol ip 10.28.1.29
encapsulation aal5snap
!
dsl operating-mode auto
hold-queue 224 in
!
ip nat inside source list 101 interface ATM0 overload
ip classless
ip route 0.0.0.0 0.0.0.0 10.28.1.29
no ip http server
!
access-list 101 permit ip 192.168.25.0 0.0.0.255 any
!
line con 0
stopbits 1
line vty 0 4
password thepassword
login
!
scheduler max-task-time 5000
end

What might be the problem? What do I need to change to open a different Port?
I'm have tried this service but it has not worked form me, I think my router configuration is not correct for this service. I will appreciate your help very much

Thanks

From this configuration, your provider is NATing your IP address. You need to find out what Public IP your provider is using for you, then use that as the server IP.