Help me fix this

[KAJE]

My computer system time keeps on changing every time and when there are auditing being carried out at some times it appears i was working during the night. how can i sought out this. the machine runs windows 7 and another one with xp sp3.

[patio]

Replace the CMOS battery...Part # CR 2032 available anywhere...
Do this with all power to the unit removed.

[truenorth]

An interesting discovery my wife just made (actually i discovered it from something she did). She recently bought a 3 pack of simulated battery driven candles (like a real tea candle) from a dollar store.3 in a pack including 3 batteries. Total cost  $1.00 all the batteries were CR 2032's. Therefore an alternative source is available.truenorth