The ASP.NET state service (Aspnet_state.exe) is not installed when you install the 32-bit version of ASP.NET 2.0 on a 64-bit computer

When you install the 32-bit version of Microsoft ASP.NET 2.0 on a 64-bit computer, the ASP.NET state service (Aspnet_state.exe) is not installed. The following error message may be logged in the Aspnetsetup.log file:Additionally, you may notice that the following registry subkey does not contain the registry information for the ASP.NET state service:

This problem may occur when one of the following conditions is true:

• You install only the 32-bit version of ASP.NET 2.0 on a 64-bit computer where Microsoft Internet Information Services (IIS) is already configured to run in Microsoft Windows on Windows 64 (WOW64) mode.
• You uninstall the 64-bit version of ASP.NET 2.0 before you install the 32-bit version of ASP.NET 2.0.

To resolve this problem, install the 64-bit version of ASP.NET 2.0 before you install the 32-bit version of ASP.NET 2.0.

Note The information in this article applies only to 64-bit computers that are running the 32-bit version of ASP.NET 2.0 and IIS in WOW64 mode. Additionally, the following steps configure the computer to run the 32-bit version of ASP.NET 2.0 and IIS in WOW64 mode.

To resolve this problem, follow these steps:

1. If you already installed the 32-bit version of ASP.NET 2.0 on the computer, run the following command to uninstall the 32-bit version of ASP.NET 2.0:
   Framework\v2.0.50727\aspnet_regiis -u
2. Run the following command to switch IIS to run in native mode:
   cscript DriveLetter:\inetpub\AdminScripts\adsutil.vbs set w3svc/AppPools/Enable32BitAppOnWin64 0
3. Run the following command to install the 64-bit version of ASP.NET 2.0:
   Framework64\v2.0.50727\aspnet_regiis -i
4. Run the following command to switch IIS to run in WOW64 mode:
   cscript DriveLetter:\inetpub\AdminScripts\adsutil.vbs set w3svc/AppPools/Enable32BitAppOnWin64 1
5. Run the following command to install the 32-bit version of ASP.NET 2.0:
   Framework\v2.0.50727\aspnet_regiis -i

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section.

Steps to reproduce the problem

1. Run the following command to switch IIS to run in WOW64 mode:
   cscript DriveLetter:\inetpub\AdminScripts\adsutil.vbs set w3svc/AppPools/Enable32BitAppOnWin64 1
2. Install the Microsoft .NET Framework.
   
   Note You expect the ASP.NET state service to be installed under the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state
   However, the ASP.NET state service is not installed.

To reproduce the problem without installing the .NET Framework on a 64-bit computer, follow these steps:

1. On a 64-bit computer, run the following command to switch IIS to run in native mode if it is necessary:
   cscript DriveLetter:\inetpub\AdminScripts\adsutil.vbs set w3svc/AppPools/Enable32BitAppOnWin64 0
2. Run the following command to uninstall the 64-bit version of ASP.NET 2.0:
   Framework64\aspnet_regiis -u
3. Run the following command to switch IIS to run in WOW64 mode:
   cscript DriveLetter:\inetpub\AdminScripts\adsutil.vbs set w3svc/AppPools/Enable32BitAppOnWin64 1
4. Run the following command to install the 32-bit version of ASP.NET 2.0:
   Framework\aspnet_Regiis -i -enable
   Note You expect the ASP.NET state service to be installed under the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aspnet_state
   However, the ASP.NET state service is not installed.

For more information about the ASP.NET state service, visit the following Microsoft Developer Network (MSDN) Web site: