HTTP Error 500.0 - Internal Server Error. Error Code 0x00000000
<p>I have a php page of ContactUs form when i submit the form a error page displayed with following error.I am not sure about my code.Please let me know cause of this error so that i can improve it.
Waiting for early response.</p>

<p><em><strong>Error:</em></strong></p>

<p>"Server Error in Application "GIST.IN"
Internet Information Services 7.0</p>

<p>Error Summary
HTTP Error 500.0 - Internal Server Error
The page cannot be displayed because an internal server error has occurred. 
Detailed Error Information
Module IsapiModule 
Notification ExecuteRequestHandler 
Handler PHP 
Error Code 0x00000000 </p>

<p>Requested URL <a href="http://gist.in:80/contactus_submit.php" rel="nofollow">http://gist.in:80/contactus_submit.php</a> 
Physical Path D:\WEBDATA\gist.in\contactus_submit.php 
Logon Method Anonymous 
Logon User Anonymous "</p>
