I have trouble with Revit 10 Architecture CZECH language version 64bit under Windows 7/64b Home Premium.
When I click to menu for display full ribbon option, Revit stay unstable and Windows must close it (as you can see at video). This was happen after right click to any place in top of the ribbon menu too (isn´t demonstrated in the video)
http://screencast.com/t/38SPR8X2ETcc
In the system log are a kernel error warnings and before this a DOTNET warning was displayed: 
http://screencast.com/t/0Jw654xHcm
.NET Runtime version 2.0.50727.4952 - Failed to CoCreate profiler.
Názov chybovej aplikácie: Revit.exe, verzia: 2010.0.2009.917, časová značka: 0x4ab2ba9c
Názov chybového modulu: KERNELBASE.dll, verzia: 6.1.7600.16385, časová značka: 0x4a5bdfe0
Kód výnimky: 0xe0434f4d

 
 

I have this update installed:
Autodesk Revit Architecture 2010 Update 2_64-bit (exe – 94.1 MB)

 

I will try install Revit 2011 ENG 64bit version, and this working on the same system fine, as you see in video
Difference between Revit 2010 CZECH 64 bit vith Service Pack 2 installed and Revit 2011 ENG 64 bit:
http://screencast.com/t/gZ11rRzk0T4W