"The specified module could not be found" asp.net mvc app on IIS 7, windows server 2008

We have an ASP.NET MVC application working on a 32bit Windows Server 2003 with IIS 6.

After deploying it on a 64bit Windows Server 2008 R2 with IIS 7.5 it stopped working. We get the following error:

"Could not load file or assembly '###.dll' or one of its dependencies. The specified module could not be found"

The dll is a 3rd party dll, and we can not re-compile it. We tried putting it in every pos开发者_如何学运维sible directory but nothing helped. It appears in the Fusion log and the last line of this files log contains "IL assembly loaded from C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary .....".

The application pool runs in Integrated mode and "Enable 32-bit applications" is set to True.

Any help would be appreciated.

Thank you,

Katie D.

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Do you have MVC3 installed? It is a separate install.

Maybe check your 3rd party dll with a tool like reflector to see what it relies on.