Registry hack/group policy setting to allow changes to Automatic update settings in Win 2k ISA server

I'm running Win 2k ISA Proxy server.  Automatic updates is turned on for 11:00pm daily.  I want to change the time (& perhaps the frequency), but it's disabled.  Is there a registry hack to do this?  Is there a group policy setting/registry hack to change to circumvent the "disable setting"?
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HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update
More info at

Hope I could help
FaulkenatorAuthor Commented:
Thanks!  These two replies do the job.
Excellent - glad i could help

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