This subkey provides more details about an update. The SQUID for each update, regardless of whether the update is registered, applied, superseded, or obsoleted, is listed here.Ī subkey under the Patches node that is named by using the SQUID of the particular update. The information about each update is listed in the following two locations: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\\Patches\ Information about the updates that are installed for the particular product is recorded under the following Patches subkey: The squished GUID (or SQUID for short) is an internal representation of the GUID that represents the product code property in the. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\ Windows Installer stores information about each Windows Installer-based product under the following registry subkey: This tool lets you bring the product back to a known state so that you can reinstall updates. The Patch Registration Cleanup Tool helps resolve some issues that are related to invalid or corrupted update registration. When the data in these registry keys is no longer synchronized, maintenance mode operations cannot be performed on the product. To allow for the product to be in a serviceable state in which it can be repaired, updated, or uninstalled, it is critical for the data in these registry keys to be synchronized. Information about installed updates is stored across several registry keys and values. These registry keys help identify the state of each update: registered, applied, superseded, or obsoleted. Windows Installer uses the registry to record information about updates installed for each Windows Installer-based product.
To see usage information for this tool, type PatchRegCleanup /? at the command prompt. To download the tool, visit the following Microsoft Web site: Microsoft has released the Patch Registration Cleanup Tool. For more information, refer to this Microsoft web page: Support is ending for some versions of Windows. To continue receiving security updates for Windows, make sure you're running Windows Vista with Service Pack 2 (SP2). Support for Windows Vista Service Pack 1 (SP1) ends on July 12, 2011. Description of the Patch Registration Cleanup Tool
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