Domain Contoller in Hyper v

Hi All we recently Virtualized a DC, we also have an Exchange Server that is part of the Domain.

Since we have Virtualized the DC, Authentication on the separate Exchange Server fails, now I know this is because of time synchronization, if I run the following command on the exchange server

net time \\192.168.71.10 /set it all kicks into life again

can anyone tell me the steps I need to take to prevent this, I have read conflicting articles on the web but am still unsure of what to do?
pepps11976Asked:
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Guy LidbetterCommented:
Have you configured a domain NTP server? This should prevent issues like these...
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
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pepps11976Author Commented:
No not as yet im a bit unsure of what to do could you assist?
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pepps11976Author Commented:
We don't have a time Source server as stated in the article is there a way to do this using an external free source?
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
Most time servers are free, you could synchronize your clock against Microsoft time server if you wish (you could also sync it against universities, government agencies, etc.  I am in Canada and I am synchronizing mine against NRC.CA which stands for National Research Council).  Below are links where you could obtain IP/names for NTP servers:

http://www.pool.ntp.org/zone/@ 
http://tf.nist.gov/tf-cgi/servers.cgi
http://nrc.ca
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pepps11976Author Commented:
So once I have configured the DC as an external time source what do I do with the exchange server?
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pepps11976Author Commented:
Ok I am a bit lost and could do with some help
 I found the following Article

http://social.technet.microsoft.com/wiki/contents/articles/12709.time-services-for-a-domain-controller-on-hyper-v.aspx

and the first thing to do it says is add the Reg Key, when I go to the Reg Key I get Access Denied

On the DC I ran w32tm /query /source just to see what the source was and got The Service has not been started.

So I go into Services and realised the Windows Time service is not started when I gi to start it I get Access Denied????

can any one help
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Guy LidbetterCommented:
What account is the time service running under? It should be "Local System"
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
If you have UAC enable then ensure to start cmd.exe or regedit.exe running as administrator.
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