cannot add user credentials to access the specified physical path

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IIS7

Windows

IIS

Win2008

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i am using windows server 2008 , cannot add user credentials to access the specified physical path

I have created a website using asp.net
and i published that site to c:\...\wwwroot

and i add that site in IIS6 by
step in the way i Added
1: I clicked "Add website"
2:i gave Site Name;
3:it automaticaly added Application Pool as in my website name;
4:In physical path i gave path to "C:\...\wwwroot"
5:i clicked Test String
here it shows Authentication OK
but some error in Authorization

ERROR:(The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that <domain>\<computer_name>$ has Read access to the physical path. Then test these settings again.)

i gave IP ADDRESS

I gave PORT NUMBER

and clicked the OK button..

website added to the Site Folder

when i Browse it shows my DSL router page..

Any can help me