Because you are getting "Unable to open key HKLM\SOFTWARE\Telerik" it sounds like some sort of an install problem. For Win7 64-bit you should have the registry key as shown in the attached screenshot. Can you verify this key exists?
Some additional notes:
- Our build 2010.3.1421 does not support IE9, but it won't cause the error you are seeing. You need our latest internal build, 2010.3.1607 to gain IE9 support. The other 3 browsers you listed are fine with that 2010.3.1421.
- I see the MSCUI demop application has changed causing our demo test to fail, but it is failing at the first click since it can no longer find the element it is coded to look for, not in the way it is failing for you.
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