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Event ID: 4 Source: Microsoft-Windows-SpoolerWin32SPL

The print spooler failed to reopen an existing printer connection because it could not read the configuration information from the registry key S-1-5-18\Printers\Connections. The print spooler could not open the registry key. This can occur if the registry key is corrupt or missing, or if the registry recently became unavailable.
I had this problem on my notebook running Vista. Two warnings were logged in the system event log every 5 seconds. I ran "regedit" and added the missing key (an empty "(default)" variable type REG_SZ). Other HKEY_USERS\S-1-5-??\Printers directories had such keys. This stopped the logging of these warnings and I have not seen any side effects.

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