Windows update not listening to scheduled install date&time

I have a Windows XP SP2 machine that is on a domain at work. I am in the
registry and I am trying to play around with the settings so that I can get
about 50 other workstations to update automaticly.

I am in
\HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU

I have
AUOptions 4
AutoInstallMinorUpdates 1
DetectionFrequency 1
DetectionFrequencyEnabled 1
NoAUAsDefaultShutdownOption 1
NoAUShutdownOption 1
NoAutoRebootWithLoggedOnUsers 1
NoAutoUpdate 0
RebootRelaunchTimeout 5
RebootRelaunchTimeoutEnabled 1
RebootWarningTimeoutEnabled 0
RescheduleWaitTime 1
RescheduleWaitTimeEnabled 1
ScheduledInstallDay 4
ScheduledInstallTime 11
UseWUServer 0


Now this, according to my knowledge, should contact the Microsoft website.
Check for critical updates, download what is needed and install those updates
on Wednesday at 11:00am. Now from what I can see it seems to download the
updates I need (I get the pop up saying there are updates downloaded and
ready to install) however, Windows does not automaticly install them.

Any clue as to why not? I am registered for notifies on this thread so if
there is some missing information that you need let me know and I will answer
asap.

Thanks in advance
.

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