Client computer not synching time to domain controller

We have a windows 2003 domain controller that's also the time server.  We also have a windows XP laptop that's a member of the domain.  both have the same time zone set (-6:00, central america time).

For some reason the user said his calendar wasn't synchronizing on his blackberry (server is also running blackberry enterprise server).  I checked, and his time is 1hr early (i.e. if the server time is 5:00PM, his local client time will be 4:00PM).  I checked, and they're both in the same time zone.  He can change the time to be correct, but it resets itself after a few minutes.

I do a "net time" from his command prompt, and it shows the server as being -5:00 time zone, where in fact it's actually -6:00... i'm certain this is the problem.

what can i do?
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Mike ThomasConsultantCommented:
Is daylight saving ticked/unticked on the client xp machine?

Try ticking/unticking that maybe.
do you have the latest  DST patch installed on the PC?

and all necessary time related updates on the server?

Make sure also you have Automatically Adjust Clock for Daylight Savings Changes in Date and Time properties on the PC
Mystical_IceAuthor Commented:
yes 'automatically adjust clock for daylight savings changes' are done.
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what about the updates?
check the timing in the BIOS
Mystical_IceAuthor Commented:
Issue was resolved by Microsoft tech support by installing this patch:

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