First of all, try to uninstall all existing versions of the sdk. After you
did that, open your registry and delete the following (if they exist)
HKEY_LOCAL_MACHINE\Software\Microsoft\.NETFramewor k
HKEY_LOCAL_MACHINE\Software\Microsoft\NET Framework Setup
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Uninstall
\{C9913503-1500-4454-94CD-365ADC1BB9B9}
Restart, and install the Framework.
( PS: Btw, I also posted the same reply at the 'other' place that you posted too

He and me are the same persons, only thing is I was called by that name even before I known as dexter.. That was my original nick- even before the net came to India

)