The DRV_REMOVE message is sent by an application to an installable driver to notify the driver that it is about to be removed from the system.
dwDriverIdentifier
Specifies a unique 32-bit value that identifies the installable driver.
lParam1
Not used.
lParam2
Not used.
An installable driver returns nonzero if it processes this message. Otherwise, it returns zero.
When an installable driver receives this message, it should remove necessary entries from the SYSTEM.INI file.