NT AUTHORITY\NETWORK SERVICE does not have write access

When you have created virtual directory of your application created in .Net2.0 and application is not running.
Even everything is fine in web.config, still it is giving error in web.config file.

Error :- The current identity (NT AUTHORITY\NETWORK SERVICE) does not have write access to 'C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727\Temporary ASP.NET Files'.

Solution is :
goto command prompt then navigate to directory
C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727

Now run this command

aspnet_regiis -ga "NT AUTHORITY\NETWORK SERVICE"