how to publish the network drive as virtual directory in iis

Hi sir,
I need steps to publish the network drive as virtual directory in IIS.
I tried to host the network drive as virtual directory in IIS. I am getting the below error . Kindly give me the solution to solve the problem.

[Note: I gave full permission to network drive. I Change the application pool settings Advance Setting==> Application Pool Identity==>Custom account and i provide the username and password to access]

Still i did not access the drive.



Error:
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Server Error

Internet Information Services 7.5
Error Summary
HTTP Error 500.19 - Internal Server Error
The requested page cannot be accessed because the related configuration data for the page is invalid.
Detailed Error Information
Module IIS Web Core
Notification BeginRequest
Handler Not yet determined
Error Code 0x80070005
Config Error Cannot read configuration file due to insufficient permissions
Config File \\?\UNC\prabupc\candidate\web.config
Requested URL http://localhost:80/dbsvrss
Physical Path \\prabupc\candidate
Logon Method Not yet determined
Logon User Not yet determined
Config Source

-1:
0:

Links and More Information This error occurs when there is a problem reading the configuration file for the Web server or Web application. In some cases, the event logs may contain more information about what caused this error.

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Tags: IIS 7.0, ASP.NET, IIS