The fix to the 0x80243004 and 80243004 errors for Windows Update is overly simplistic, but definitely worth retaining considering the problems are reported pretty regularly.
Per KB2837515, the cause is that the Automatic Update client requires that the tray icon be managed either by Group Policy, or that it be displayed if not disabled by Group Policy.
And, again, the fix is a simple one:
- In the notification area at the far right hand side of the taskbar, click the Show hidden icons button and then click Customize.
- In Notification Area Icons, under Icons, scroll down to find Windows Update. Click the drop-down list next to it, click Show icon and notifications and then click OK.
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