Ok this is killing me, I normally am pretty good at fixing my computer, but this one has me stuck

My clock will not stay on the time I set it,  it JUMPS around during use of my computer.  It never seems to go backwards only forwards.  It also doesn't just jump hours and minutes, often jumps months and years.  Now I custom built the PC about two years ago and have never had trouble.  Recently I did a fresh wipe and installed Windows 7... Now the issue didn't start there, I ran Windows 7 just fine for about over a week and not once did I have an issue with my clock.  Though on an unrelated topic my Frames per second were dropping in certain games, thus I decided to do one more clean wipe and see if that would fix the problem.  Oddly that worked, but now I'm left here, with my clock that RANDOMLY switches to what EVER times it wants.  This time change also takes place in my bios. I would love some help and would give major kudos to anyone who can figure this out...

Things I have already tried
- Resetting Bios via jumper and battery
- Replacing the battery with a new one (did this twice)
- UPDATING the Bios
- Making sure the time in Bios was correct
- In Windows the correct time zone is CHOSEN
- Time sync with time-a.nist.gov, time-b.nist.gov, time.windows.com, time.nist.gov, time-nw.nist.gov (all work at first but time eventually changes)
- Disabling Sync with an Internet Time server
- Disabling adjustment with Daylight savings (getting desperate) You've tried all the obvious things... when did you last check for malware/virus/adware infections? Some malware is known to change system time settings in order to nullify AV protection. You did a fresh install of Windows 7, following which you were OK for a while (Is that right?) but maybe you got reinfected. Another explanation would be defective hardware (motherboard chipset)

My vote is on defective hardware.

What's the make and model of your motherboard?try some of the suggestions listed for this fellow with a similar issue:

http://social.answers.microsoft.com/Forums/en/w7performance/thread/fe970d11-2411-4224-8087-66a15b337a54