Also.. I'm running Windows 7 RC 7100...
The Windows 7 RC, expired, you need to upgrade to the final version, that is now programed to reboot all the time.
the jump from 1.6 to 2.4 is normal, the CPU adjust it's speed based on demand to give best balance of energy use and performance.
If your experiancing high cpu temperatures ensure the heat sink is mounted correctly and fan operates well.