HELP ME :( When i want use WD Quick Formatter this error happend ! ( pic )

My device is My Passport Essential SE  750GB

You need to uninstall the smartware software. It is bloatware and often times a resource hog. So uninstall it and format the drive using the windows option by right clickin on the drive and FORMAT…

When you format it delete the volume first. Make sure you select the right drive.