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You should be able to view the drivers when you boot into safe mode - you can use the keyboard in that environment, correct?
If you have the battery pulled out of the laptop, it SHOULD still show in the device manager, but it may not depending on how your system is set up.
Several laptop manufacturers have their own version of power management software - it often sits on top of windows APM/APIC and changes the windows settings for you - less often it will work below the windows stuff, and change low-level settings. If you can, I'd try to uninstall the Acer stuff and see if you still have problems with just the windows settings.
~Bill
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