Murugan,
I'll tell you straight away your problem.
You are on Windows Platform with IIS enabled, so the default ports for web server"80" is already assigned to your IIS, whilst the package you downloaded is relying on Apache server, which as well wants to work on port 80 which is already assigned to IIS.
Now being Windows O/S and IIS being their product, why would they want something else (Apache) to take over just like that, until you specify in Apache, the default port to use is port 80.
If, you havent had IIS already installed, then Apache could have claimed the port 80 for its use, but seeing IIS as sitting there already, Apache must have taken some other port for its use.
you can do 3 things,
1: uninstall IIS and let Apache take over as web server.
2: configure ports to be used in Apache as port 80.
3: See which port is Apache working on, and then use that port to use moodle.
to configure apache to listen on port 80, edit the httpd.conf file in Apache (file can be found in server/apache/config directory) , and find the line where its written Listen, and there will be some port number assigned after that, change it to Listen 80, save and and restart Apache.
by Usman Asar.