In tip 2579 » The device driver for the 'PC/AT Enhanced PS/2 Keyboard(101/102-Key)'device is preventing the machine from entering hibernation?, I stated that the ATM 4.0 Atmhelpr.sys driver prevents hibernation.
Here is a workaround for ATM 4.0 Deluxe:
1. Rename Atmhelpr.sys to Atmhelpr.jsi.
2. Restart your computer.
3. Enable font smothing, as this is no longer performed by ATM.