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In  IIS MMC  > Select site / Virtual Directory  > Select Features View  >  Select 'Authentication'  > Select top row 'Anonymous Authentication' >  In the right panel Select 'Edit'  > In the pop up window Select 'Application Pool Identity'   From  IIS 7 - ApplPoolIdentity (It is the default in IIS 8) is introduced  for the higher level of Application pool isolation in place of NetworkService. As more and more windows applications started to use NetworkService, AppPoolIdentity provides tighter security to your application pool from other application pool processes. http://technet.microsoft.com/library/hh831496.aspx#Anonymous

    On Windows 8, if you install Umbraco 5.1 and any other software you need ASP.NET 4.0 . After all the prerequisites installed if you try running aspnet_regiis -ir , you will get below information. But in Win8 - IIS 8 - default framewrok is .net framework 4.5 (also supports 3.5)  .And you won't find 'ASP.NET 4.0' in the Application pool list. From the 'add application pool' - you have to choose .net 4.5 from the drop down . This will take care of Umbraco 5.1 install running from your IIS 8. If you have permission issues , add 'Modify' permission to  IIS_IUSER . You can do this from IIS rightside menus or from the File explorer -> Right click on the file >select -property > select Security Tab > . ------ aspnet_regiis -ir install result. C:\Windows\Microsoft.NET\Framework\v4.0.30319>aspnet_regiis -ir Microsoft (R) ASP.NET RegIIS version 4.0.30319.17379 Administration utility to install and uninstall ASP.NET on the local machin...