The short summary of all of this is that it is not possible to (safely) delete the uninstallation backup files in Vista/W7, except for the special case of service packs for which a specific tool, different for each service pack, is provided.
The short summary of all of this is that it is not possible to (safely) delete the uninstallation backup files in Vista/W7, except for the special case of service packs for which a specific tool, different for each service pack, is provided.