I have the same problems as listed above.
Everyday my computer completely freezes for hours on end. I have been able to narrow it down to being related to the kernel-power events in the Event Viewer as each time I have to hard reboot the system there is a new entry under this section. I have also tried all the power settings possible to alleviate the problems but have had no success.
I have attached the picture of my Event Viewer with all of the kernel-power incidents listed, each of which lead to a completely frozen computer; 22 in total, which in reality, would be higher due to the fact that much of the time it remains frozen for hours in which time a reboot would only lead to another freeze. I have seen it as bad a 5 or so freezes within about a 2-3 hour period; VERY annoying.
Windows7 Build 7000
AMD Turion X2 Ultra
ATI Radeon HD 3650
(you probably don't need the last two lines though)