Domain Controller NTP Server

We have Server 2008 with all the DST patches applied that I am aware of.  The issue is the ntp server starts displaying the correct time after reboot but changes after about an hour to 1 hour off.  Does anyone know what fixes this issue?
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if you applied all patches then you should be ok , unless you missed something ? does this windows 2008 sp2 ? r2 ?
Also did you check the time on the bios for this server ?
The Time Zone of this server is set to a different time zone than the pdc.

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Jack_son_Author Commented:
yes, its 2008 sp2; both are on the same timzone as well
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Jack_son_Author Commented:
They are up to date on patches, do you know a specific patch?
Jack_son_Author Commented:
System cannot log you in due to the following error:

There is a time difference between the Client and Server.
Does this Servers exist in the same TIME ZONE? if yes, make one DC as the PDC Emulator and point it to an external time server. Then make other DCs to point to Interal timer Server (PDC emulator) so as the workstations.  
net time is a deprecated method in 2K3 and XP.

Assuming that this is a single-domain environment:

[1]  Configure your PDC Emulator to point to an external time source, as described here:

For all other DCs, member servers and workstations, configure the W32Time service to use its default settings as follows:

[1] Stop the w32time service
[2] Run w32tm /unregister && w32tm /register at the command prompt
[3] Start the w32time service

Your 2nd DC will receive its time from your PDC Emulator.  Your member servers and workstations will receive their time from the DC that authenticated them, which may or may not be the PDCe.  Look for successful entries in the System Log of all machines involved from the w32time service, indicating which server each machine is obtaining its time from.

Configuring the Windows Time service to use an internal hardware clock

run at comannd prompt in client machines : C:\>net time /query
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Windows Server 2008

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