32 Bit Application Installed on 64bit IIS App Pool

http://support.microsoft.com/kb/894435

Microsoft has the documentation for the article, but I wanted to embellish on this to express you may see some odd event error about the processor or provider is not specified , or isapi functionality as event id. 2268  or Event id 2274 the isapi filter could not be loaded becase of a configuration problem.  These are all indications that your app pool has been changed to 32bit. here is some links to express the issue, and you use KB 894435 to make it right.

http://technet.microsoft.com/en-us/library/cc735165(v=ws.10).aspx

http://technet.microsoft.com/en-us/library/cc735001(v=ws.10).aspx

http://blogs.msdn.com/b/rakkimk/archive/2007/11/03/iis7-running-32-bit-and-64-bit-asp-net-versions-at-the-same-time-on-different-worker-processes.aspx

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