Windows Incorrect Time

[feindre]

The OS on one of my W7 machines doesn't want to keep the correct time and I can't figure out why. The first thing I did was check the BIOS and it keeps the right time. I've gone into date and time and confirmed that the time zone is correct (MST) and even manually set the time several times but it always changes to an incorrect time. I've changed the time sync server to different servers and it has the correct time at first, but inevitably changes within a few minutes to a wrong time. The only thing I can find on google suggest it's the CMOS battery, but it's a new motherboard and the BIOS keeps the correct time, as I've said above. Below is my system specs. Anyone else having this problem or maybe a solution?

ASUS P8Z68-V PRO
EVGA GeForce GTX 550 Ti
2 x Western Digital Caviar Green 2 TB Desktop Hard Drive WD20EARX
CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600
Intel Core i5-2500
Thermaltake 240-pin 850w PSU

 

[hang-the-9]

How exactly is the time wrong? Is it wrong by an hour? Several minutes? Date is off?