Service Unavailable message running EEE on 64 bit machine

From EnablerWiki

Created: 14 September 2009. Last Reviewed: 16 December 2009

If you receive ‘Service Unavailable’ when loading EEE (or any other .Net app), and Event ID 2274 (Source: W3SVC-WP) in the Windows Application Log, you can follow these steps to resolve:

ASP.NET 2.0, 64-bit version

To run the 64-bit version of ASP.NET 2.0, follow these steps:

1. Click Start, click Run, type cmd, and then click OK.

2. Type the following command to disable the 32-bit mode:

cscript %SYSTEMDRIVE%\inetpub\adminscripts\adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 0

3. Type the following command to install the version of ASP.NET 2.0 and to install the script maps at the IIS root and under:

%SYSTEMROOT%\Microsoft.NET\Framework64\v2.0.50727\aspnet_regiis.exe -i

4. Make sure that the status of ASP.NET version 2.0.50727 is set to Allowed in the Web service extension list in Internet Information Services Manager.

Note The build version of ASP.NET 2.0 may differ depending on what the currently released build version is. These steps are for build version 2.0.50727.

Taken from: http://support.microsoft.com/default.aspx?scid=kb;en-us;894435

This is a restriction with IIS and .Net 1.1 running on a 64-bit server.  The older .Net 1.1 cannot run correctly on 64-bit.