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When upgrading from one Vista edition to another Vista edition, the functionality in KB 971644 - "Platform Update for Windows Vista" may be lost. This scenario occurs when the original Vista edition had KB 971644 installed.
When upgrading from one edition of Windows Vista with KB 971644 - "Platform Update for Windows Vista" to another edition of Windows Vista (for example, upgrading from Professional to Ultimate), the registry keys added by KB 971644 will be removed from the registry and pre-existing binaries which were updated by Windows 7 IP will be replaced with the non-updated versions provided by the new edition of Vista. New binaries introduced by KB 971644 that did not previously exist in Windows Vista will remain but without their corresponding registry key entries.
To resolve this issue, reinstall the KB 971644 - "Platform Update for Windows Vista" update after upgrading to the new edition.
The following scenario is provided as an example of this behavior.
1. The user has installed Windows Vista Home Premium edition with appropriate service packs
2. The user then installs KB 971644 - “Platform Update for Windows Vista”
3. Later, the user upgrades to Windows Vista Ultimate edition with appropriate service packs
· KB 971644 - “Platform Update for Windows Vista” is overwritten on the system
o All KBs related to KB 971644 under “Installed Update” entries are removed
o Pre-existing Vista binaries that were updated by KB are replaced with the pre-KB 97164 versions provided in the Vista upgrade.
o New binaries introduced to Vista through KB 971644 will remain unchanged in the system folders
o All registry keys for all binaries in KB 971644 are deleted
· Upgraded Windows Vista functions normally but KB 971644 functionality is no longer available.
Required Steps to restore functionality:
1. Re-install the KB 971644 - “Platform Update for Windows Vista” update .
All KB 971644 updates are applied and KB 971644 functionality is available to the upgraded system.
For information on KB 971644 click on the link below:
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Windows Vista Service Pack 2, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Ultimate, Windows Vista Business, Windows Vista Enterprise, Windows Vista Home Basic 64-bit Edition, Windows Vista Home Premium 64-bit Edition, Windows Vista Ultimate 64-bit Edition, Windows Vista Enterprise 64-bit Edition, Windows Vista Business 64-bit Edition