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ArcGIS Server 9.2 and higher is supported on the Intel and AMD 64-bit processor families.
ArcGIS Server is a native 32-bit application. It is certified to run as a 32-bit application on 64-bit (x64) Microsoft Windows. Instructions provided describe how to run the Internet Information Services (IIS) and ASP.NET 2.0 in 32-bit mode.
Run IIS in 32-bit mode and install the 32-bit version of ASP.NET 2.0. Detailed instructions are available from Microsoft at the following link:
Running IIS in 32-bit mode
IIS does not support running both 32-bit and 64-bit modes at the same time on a 64-bit version of Windows. Since ArcGIS Server for the Microsoft .NET Framework requires IIS and ASP.NET to run on 32-bit mode, other applications that require being run on 64-bit mode cannot be applied to the same server. For example, running IIS/Tomcat using the 64-bit isapi_redirect.dll on a 64-bit server cannot coexist on the same 64-bit server as ArcGIS Server for the Microsoft .NET Framework, since the isapi_redirect.dll requires to be ran on 64-bit mode. More information on this limitation is available from Microsoft: Switching between the 32-bit versions of ASP.NET 1.1 and the 64-bit version of ASP.NET 2.0.