Here is a workaround to the issue:
0) Have admin rights on the machine
1) Open the command line prompt (Start => Run => type CMD)
2) Navigate to the directory:
3) Type "rkernel.EXE /RegServer"
I had the problem today on one of my student's computer running Inventor 2012 SP2 with XP Pro (x86). The solution works but the file is not in Program Files\Autodesk\ROBOT Kernel 23.0\System\Exe
This folder doesn't exist at all.
The files are in Program files\Common Files\Autodesk Shared\Autodesk Robot Structural Analysis Engine 2012\System\Exe
In the french version of windows it's Program files\Fichiers Communs\Autodesk Shared\Autodesk Robot Structural Analysis Engine 2012\System\Exe
Maybe it's because they have an educationnal version, I don't know, but anyway the files are in this folder
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