Bootstapper for checking the .Net Framwork 4.0.2 update

If you check HKLM\Software\Microsoft\NET Framework Setup\NDP\v4
and HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\v4.0.30319\SKUs\.NETFramework,Version=v4.0.2
you will find there's nothing you can use the do the checkpoint for your bootstrapper.
The .Net Framework 4.0.2 is installed by the update KB2544514, so our target is this KB updates information.
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Updates\Microsoft .NET Framework 4 Client Profile\KB2544514]

But this is not a MSDN way, I have not found a way for this checking in MSDN documents.

ref from my Google blog: http://mikedoszhang.blogspot.com/2012/04/bootstapper-for-checking-net-framwork.html