asp.net access denied

Jeg har netop instaleret .net på min webserver, og lavet et lille test.aspx, men får flg.:

Access denied to 'D:\www\' directory. Failed to start monitoring directory changes.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Web.HttpException: Access denied to 'D:\www\' directory. Failed to start monitoring directory changes.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. 

Stack Trace:


[HttpException (0x80004005): Access denied to 'D:\www\kunder\' directory. Failed to start monitoring directory changes.]
  System.Web.FileChangesMonitor.StartMonitoringDirectoryRenamesAndBinDirectory(String dir, FileChangeEventHandler callback) +446
  System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +324

[HttpException (0x80004005): ASP.NET Initialization Error]
  System.Web.HttpRuntime.FirstRequestInit(HttpContext context) +927
  System.Web.HttpRuntime.ProcessRequestInternal(HttpWorkerRequest wr) +128

Jeg har checket http://www.asp.net/security.aspx, og givet rettigheder til aspnet_wp brugeren, men det hjalp ikke

Hvad kan jeg ellers gøre?