Error launching Infoview on Windows 2003 R2 SP2 64 bits

Question

In our Lab, just installed BO XI 3.1 on a Windows 2003 R2 SP2 32 bits AND a Windows 2003 R2 SP2 64 bits servers.
When launching Infoview on the 64 bits server, I get the following error message:
Server Error in '/InfoViewApp' Application
Runtime Error
Description: An application error occurred on the server. The current custom error settings for this applicationprevent the details of the application error from being viewed.
Details: To enable the details of this specific error message to be viewable on the local server machine, please create <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application....
I did modify the web.config file for the tag: <customErrors mode="RemoteOnly"/>
When accessing Infoview after the change, I get:
Server Error in '/InfoViewApp' Application
Retrieving the COM class factory for component with CLSI {E063B04A-CB8B-460E-99D0-F7D8FA2FAAA2} failed due to the following error: 80040154
Description: An unhandled exception occurred during the execution of the current web request. Pleas review the stack trace....
I don't have any problems accessing Infoview on my 32 bits server. Same installation procedure.
I uninstalled BO on my 64 bits server and reinstalled without solving my problem.
Any ideas or experience with 64 bits envir.?
Thanks for any advice, suggestions. Wondering if I should just be going with 32 bits but we're trying to go with as many 64 bits servers in the field.
Regards

Answer 1

Denis,
You pointed me in the right direction. Found something in the DB knowledge of  SAP (with some patience..).
I'm not too sure if it's the article ID but here's what show up next to the title: 1326978
Mainly, here's the solution:
Symptom
How to configure XI 3.1 with Win2003 64-bit using IIS
When navigating to InfoView, user receives "Server Error" message. 
Server Error in '/businessobjects/Enterprise115/InfoView' Application.  -- displayed for XIR2
Server Error in '/InfoViewApp/ Application.  -- displayed for XI 3.x
Reproducing the Issue
Issue could occur in any 32-bit version of XI (XIR2 and XI 3.x) that supports 64 bit windows 2003 operating systems
Cause
While newer versions of XIR2 and XI 3.x are supported on 64 bit OS's they do not currently support 64 bit .net 
Resolution
XI 3.1 is a 32-bit application and InfoView/CMC cannot run while IIS is in 64-bit mode.  In addition, IIS cannot run in both 32-bit and 64-bit modes simultaneously.  Follow these steps to change IIS to run in 32-bit mode and unregister/register the correct IIS app pools.
Open the windows command prompt and do the following:
To disable 64-bit .NET 2.0:
cd C:\windows\microsoft.net\Framework64\v2.0.50727
aspnet_regiis /u
To enable IIS to run in 32-bit mode:
cd C:\Inetpub\AdminScripts
cscript adsutil.vbs SET W3SVC/AppPools/Enable32bitAppOnWin64 1
To enable 32-bit .NET 2.0:
cd \WINDOWS\microsoft.net\Framework\v2.0.50727
aspnet_regiis /i
In IIS manager under Web Service Extensions:
ASP.NET v2.0.50727 (32-bit) (The new one that appeared when you enabled 32-bit .NET 2.0) Set  to Allow.
ASP.NET v2.0.50727 (the 64-bit version that has been there since you installed .NET 2.0 framework) If it is still listed, Set to Prohibit.
Restart IIS (via Windows command prompt)
iisreset
I am now able to get to the login screen of InfoView but I'm missing the type of authentication field (Enterprise, Windows AD)
I'll take a look early tomorrow.
Thanks again.
Jay