TMG Forefront 2010 is not install error generate A Computer restart is require

TMG Forefront 2010 is not install error generate A Computer restart is require after restart when run installation then again and again.
Log file 
09:15:55 ERROR:CSSEInstaller::GetInstanceId failed to open reg key 'SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL'
09:15:55 INFO:CSSEInstaller::Prepare: Failed to get the instace id of MSFW
09:15:55 ERROR:CSSEInstaller::GetInstanceId failed to open reg key 'SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL'
09:17:10 ERROR:Setup failed. Error returned: 0x643
09:17:10 ERROR:CBasicInstaller: Install failed, hr=0x80070643
09:17:10 ERROR:Installation failed. hr = 0x80070643
09:17:10 ERROR:Installation failed, hr=0x80070643
09:17:10 ERROR:InstallProducts: Install ISA (Core components) failed, hr=0x80070643
09:17:12 ERROR:Wrapper: Install failed, hr = 0x80070643
09:17:12 ERROR:Wrapper: DoSetup failed, hr = 0x80070643
09:17:12 ERROR:Wrapper: DoSetup failed, hr = 80070643
09:17:12 ERROR:Setup of ISA failed. Return value: SETUP_ERROR_ISA