TMG error Installation Failed C:\Programs Files (86) \microsoft sql server \100\setupbootstrap\LOG\Files

Hello,
I'm trying to install Forefront TMG 2010 in a windows sever 2008 Standard x64 on Dell Power Edge R720, the installation became failed, the error is:

For troubleshooting help, see the Setup logs:

C:\Windows\Temp

C:\Program Files (x86)\microsoft sql sever\100\Setup

Bootstrap\LOG\Files

 Please help me and fix this problem for me.

Thanks,

Noor