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Redhat Enterprise 5.4 Clock/Time issue when running as a VM under MS Hyper-V Server 2008 R2

We have a Hyper0V Server 2K8 R2.  We created a virtual machine and loaded Redhat Enterprise 5.4.   It seems like the VM will not keep proper time.   We have set up a cron job that will update the clock every 15 minutes or so, but that obviously is not the solution.   Does any one have any fixes for this issue?
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Kerem ERSOY

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Kerem ERSOY

Oops sorry this command for starting the ntpd should read:
service ntpd start

not

service ntpd on

Cheers,
K.
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I'll have another suggestion that I've myself applied for some time now. Though you can synchronize using the pit clock it is also a hardware emulation clock which would lead some errors now and then. The only thing it fixes is to prevent the clock gain 50 seconds in 1 minute !! Apart from that it is not an accurate time.

My suggestion is to apply the changes to your hyper-v system and convert it to an NTP time source then use NTP and synchronize time with this system . This has another advantage that all your systems will have a synchronized clock and if you use, you'll have consistent logs all over your network.

Here's the article:  http://support.microsoft.com/kb/816042

Cheers,
K.
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I am working the suggestions.