Windows On MacBook Pro Retina (Mid-2014)

Hey,

I recently installed Windows 8.1 onto my macbook pro retina (mid 2014) through bootcamp with a bootable usb.

I since uninstalled it, I search how to do it, and lots of people said to do it through bootcamp, and remove the partition in disk utility (I'm not sure it was a while ago) So that's what I did. All I have in Disk Utility is "Macintosh HD"

Every time I turn on or restart my macbook it boots up into windows and says it needs a system recovery disk, but then I just turn it off again and hold the option key and boot into yosemite. How can I stop this windows error coming up? I thought I had already erased the partition seeing as there's nothing in disk utility?

Any suggestions?