1. Enable the 32-bit mode on x64 Windows server
cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
2. Install the version of ASP.NET 1.1 and the script maps at the IIS root and under
%SYSTEMROOT%\Microsoft.NET\Framework\v1.1.4322\aspnet_regiis.exe –i
3. Install the version of ASP.NET 2.0 (32-bit) and the script maps at the IIS root and under
%SYSTEMROOT%\Microsoft.NET\Framework\v2.0.50727\aspnet_regiis.exe –i
http://www.codeproject.com/KB/aspnet/setup64bitserver.aspx
