解决方法：

 

#    Go to Control Panel   >   Uninstall Programs #    Uninstall Microsoft SQL Server 2008 #    Uninstall Microsoft SQL Server 2008 Native Client #    Go to C:\Program Files #    Delete folders ‘Microsoft Forefront Threat Management Gateway‘ and ‘Microsoft SQL Server’ #    Go to C:\Program Files (x86) #    Delete folders ‘Microsoft SQL Server’ #    Reboot your windows #    Right click on TMG Setup and select ‘ Run as Administrator‘ , and follow on the screen setup.

 

After this I installed TMG SP1 and SUP1 from

You can download SP1 from :

and you can download SU1 from :

Afterwards, download TMG SP2 , and install it.