Windows Update doesnt work on VISTA Beta 2 machiens after joining to a domain.
make a REG key by pasting this to notepad and saving it as .reg
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Windows Registry Editor Version 5.00
[-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Group Policy Objects\LocalUser\Software\Microsoft\Windows\CurrentVersion\Policies\WindowsUpdate\DisableWindowsUpdateAccess]
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoWindowsUpdate"=dword:00000000
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoWindowsUpdate"=dword:00000000
[HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate\AU]
"NoAutoUpdate"=dword:00000000
"AUOptions"=dword:00000000
[-HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\WindowsUpdate]
[-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WindowsUpdate]
[-HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoDevMgrUpdate"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main]
"NoUpdateCheck"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\WindowsUpdate]
"DisableWindowsUpdateAccess"=dword:00000000
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
"NoWindowsUpdate"=dword:00000000
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after saving it , double-click to run it , Restart to Windows Update Service and its done
this key will get back your Vista station to work with local policy, which connect to the internet for updates.