Got it,
Install the Windows 7 64 bit (works on Windows 8)
Intel AMT 4.2 Management Engine Interface for Windows 7 (32-bit, 64-bit), Vista (32-bit, 64-bit) and XP (32-bit) - ThinkPad
Go to the Lenovo site and look up your T-400 type and go to chipset.
- Malt Liquor