ESRIRegAsm.exe - No Desktop - Specified Product not installed

Question

Hi,
I got an Windows 2008 R2 with ArcGIS for Desktop and ArcGIS for Server installations.
No I developed a dll that I want to register to both: the Server and the Desktop. 
When I run
[path_to]ESRIRegAsm.exe [path_to]super.dll /p:Desktop

I got the message
[ATTACH=CONFIG]26872[/ATTACH]
When I run ESRIRegAsm.exe without a product I only see the Server to choose.

I´m not sure, but I think I installed ArcGIS for Desktop before I installed .NET 3.5.

Thanks!

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MatthiasHahn · Answer

Are you kidding me? 
The problem is this 64bit/32bit problematic

http://support.esri.com/fr/knowledgebase/techarticles/detail/40735

RichardWatson · Answer

Look in Control Panel under Programs and Features.  Does it list desktop as one of the installed programs?