Windows 7 Windows Update Domän Client manuell zulassen

Group Policy setting
If you check the registry for the DisableWindowsUpdateAccess key, you will
likely find the following:
HKEY_USERSS-1-5-18SoftwareMicrosoftWindowsCurrentVersionPoliciesWind­owsUpdate
DisableWindowsUpdateAccess REG_DWORD (1)


S-1-5-18 maps to the SYSTEM ACCOUNT


To correct the problem, either set the value to 0 or delete the key.
You may also need to check that you do not have a Group Policy that
continues to set this value to 1 to avoid the problem from happening after a
policy is refreshed.