If your drive is _ NOT _ password protected, then you can use it without installing the SES driver, but there’s nothing you can do (aside from installing the SES driver) to stop it from trying to install the driver every time you attach it.
"Your new Western Digital My Passport/My Book hard drive requires a special communications channel (SCSI) between your PC and the drive to enable certain features such as password protection, LED control, and access to the drives label if applicable.
At install, the Windows operating system detects this SCSI communications channel and attempts to install a SCSI Enclosure Services (SES) driver. This driver is only used by your hard drive and is installed by default when you first attach the drive to a computer.
However if you did not install the driver upon first install and chose not to install WD Smartware, Windows will continue to prompt you to install the driver each time you connect the drive to a computer. This will continue to occur unless the SES driver is installed."
“Western Digital still recommends installing the SES driver when not using WD SmartWare, but the drive will function without it.”