Windows XP time falling behind

I have two Windows XP machines and their time is falling behind. I set one PC's time to match the domain and it still fel behind about 12 second difference. A few days later, it's about 2 minutes behind.

Is this the CMOS battery that's causing this likely? Or what else can be causing this that I could try fixing?
garryshapeAsked:
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TymetwisterConnect With a Mentor Commented:
It's most likely the battery.  Tr changing it out.  You can also try changing the time server that windows syncs with in the clock settings... also check to make sure it's  in the right time zone and set to daylight savings if applicable.
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ggefterCommented:
ensure the windows time service is running.

and you can also check here:
http://www.computing.net/answers/windows-2003/win-server-2003-time-sync-problem/7308.html
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dragonjimConnect With a Mentor Commented:
For the little time involved (2 minutes over several days)... My first thought - CMOS battery.
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garryshapeAuthor Commented:
The time services are running and all, I haven't tried replacing the batteries, though.

What kind is needed for OptiPlex 745 and OptiPlex GX260?
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garryshapeAuthor Commented:
Nm I see in the manuals what kind
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TymetwisterCommented:
Let us know if this resolves the issue.
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scrathcyboyCommented:
Usually, if the battery is going, it DIES a fast and hard death.  So I would not suspect the battery itself -- or it is easily tested with a new LI button battery, available at walmart.  Better still you can buy on EBay 16 of these batteries from a Hong Kong supplier for almost NOTHING -- their prices are unbelievable.

If it is losing 20 seconds or so, I think that the CMOS chip on the motherboard is defective, or dying.  You can risk doing a BIOS update on that MB, and that could well fix it.  Otherwise, live with it on the MB, as it is probably not going to be fixable.  But I wish you the best in trying.
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scrathcyboyCommented:
daaah, not the CMOS chip -- the CLOCK chip -- which is fixed to the MB and can't be removed.  Best luck.
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nobusCommented:
i doubt it is the battery.   Normally the CR2032 model is used - around 4$
it looks like it's syncuing the time with another source
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garryshapeAuthor Commented:
I installed the new batteries yesterday morning about 8:45am, have been checking the times on the PC's periodically and they are up to date to the second.

The OptiPlex 745's warranty is still active for another 65 days, but the OptiPlex GX260's warranty expired in 2006.

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ggefterConnect With a Mentor Commented:
pay close attention to those 260's ... make sure that none of the capacitors are'nt bulging. Dell is replacing mobo's for free in or out of warranty cause they tend to pop. See if you can get a free board while you can
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