Home Page Problem in local server

hi, I am new to php. can any one help me this…
In my system,Wamp server 2.0 is installed.
When i click on localhost from Wamp server tray on taskbar, it is not showing index of the list of project in my server.
It shows the window like:::
"
You have chosen to open

which is a:application/x-httpd-php
from:http://localhost

What should Firefox do with this file?

like open/save file? "

Give me some suggestions to overcome this problem.
Thank you in advance.

This normally happens when Apache is not configured with PHP correctly to parse the PHP files. This should not be the case with WAMP because it configures the files itself automatically when installed. So maybe it was not installed correctly. Try removing WAMP and all other Apache, PHP, MySQL totally from your system once and see, hope something went wrong with your installation.

http://wiki.apache.org/httpd/PHPDownload