Power Manager and windows 7

[BacKInTown]

Got a T61 with integrated NVIDIA with windows 7, and lately I found out this:

Newest version of Power Manager is 3.12, but If I uninstall it and run System Update I get version 3.11a.

this one (3.11a) let me choose from a menu called "switchable graphic" two alternative options: "energy saving" and "maximum performance"
what's that? I suppose it's relatet to the newest T400 system with integrated+dedicated video card, Am I wrong?

But nothing changes, and My system is very hot and the fan is always running! It didn't use to do this!!!!