Uninstall Windows 10 from Mac without Bootcamp.

Hello there. 

I think I will die because I made hella mistake on my WORKS computer, yes is not even mine. 

It's a Mackbook air, and I was playing around and decide to install Windows 10. everything okay, installed the Bootcamp and everything and the transition was cool. I read that you could back to the Mac system so it was fine. 

On the accout set up, the settings wasn't showing up any internet connection so I skip it, thingking I could set it up later.

And when I enter to the account, the Bootcamp started downloading. NORMAL.

But the mac started to heat up and I started panicking becuase I though that on my work they can kill me for this, and in a stupid moment I stopped the instalation of Bootcamp.

For my not surprise, withot Bootcamp, I was not able to change between systems, and for my stupidity now I don't have connection to internet either.

I think I will die if I can't fix this. That computer costs more then my life...

I need to remove Windows from the Mac but I'm not able to go back to the mac sytem (Also tried to restart the pc and click on the option key but a lock appears and it does not allow me t go through)

Anyone knows if there a way to fix this? And delete Windows, from thei interface without the Bootcamp app or being able to reinstall it?

Spend like 2 hours looking for a way to fix it with no answer.

Pleaseee! 

Thank you all,

kisses