When windows deletes the driver package and driver files what situation might it not delete driver files used by the driver that is being uninstalled?

Windows might not delete driver files if they are still in use by the system or if other drivers or applications depend on them. Additionally, if the driver was manually installed or not properly registered, the uninstallation process may fail to recognize and remove all associated files. System restore points or backup features might also protect certain driver files from deletion. Lastly, if the driver was part of a larger software suite, its files might be retained for potential future use.