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.

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