Windows 7 DHCP Access is denied

Recently our IT department upgraded our computers to windows 7 professional.  Our domain controllers are running server 2003 r2.  Once I add our new computers with windows 7 to our domain and restart, the DHCP service fails to start.  When I try to restart the DHCP service I get the error that Access is Denied.  

When I go into the registry I change the permissions for DHCP and TCPIP and add local service full control.  Once I do this the DHCP service will run again but within a couple of hours or a retart the service quits and I receive the same error.

Any ideas?
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There must be something else going on... take a look at the event log and post the results here for us to see
wcqp--Perhaps of help
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wcqpAuthor Commented:
It ended up being a gpo that was applying to the computer even though it was not in the OU that the gpo was linked to.  It had been created in there, "Computers", but moved out and wasn't letting go of the gpo.

There were settings in there controlling the parameters of the TCP and AFD and their security permissions.
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Windows 7

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