To run ASpDotNetStorefront in 64bit Windows as published in Microsoft's KB at http://support.microsoft.com/kb/911720:
1. Open a command prompt by clicking Start → Run, entering "cmd" and clicking OK.
2. Type the following command to enable 32bit mode:
cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
3. Type the following command to install the version of ASP.NET 2 (32bit) and to install the script maps at the IIS root and under:
%SYSTEMROOT%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe –i
4. Make sure that the status of ASP.NET version 2.0.50727 (32bit) is set to Allowed in the Web service extension listed in IIS Manager.
Note: These instructions are provided by Microsoft. You should always make a backup before making any changes to any server or development machine.