We can take a look at the other hardware now that you are in windows but I don't believe that is the problem.
IMHO I still believe the issue is a faulty cmos battery or if not then we need to seriously look at the mobo being the problem.
This error you are getting is almost always a battery issue with very few cases being the motherboard not supplying the correct voltages to the battery. That does not appear to be the problem since the the voltage readings actually show the correct 3.3 voltages.
Therefor I have to assume at this time the battery is the culprit.
Possible you can purchase another from a different store other then where you bought the current one?
I ask because these batteries are not replaced often so it's hard to tell how long the battery has been in stock.
Do you have something like a Batteries Plus around where you live? or a Radio Shack or even a Watch Repair Shop?