I am unable access my webserver from internet. What to do?

Hey TR Buddies,
I am unable access my home made web server from internet. I have done following things to make the web server:

1- Installed XAMPP
2- Installed DYNDNS resolved Dynamic IP problem.
3- Firewall disabled.
4- Antivirus Firewall disabled.
5- Port forwarding done to the PC having XAMPP installed.

I am having Windows XP Pro Server Pack 2, 2002 OS.

Need help kindly guide me.