Bootcamp Screwed My Macbook Air (2013-mid)

I don't know what happened, I was trying to install Windows 7 via Bootcamp. I inserted the USB, and run the bootcamp utility to burn my USB with Windows 7 iso file.

Everything worked fine till, it asks me for the repartion and then restart of the MacBook Air. I partitioned the drives via sliders, and then restarted the Macbook. However, right after the reboot, I am facing an issue with error "nobootable data" furthermore, when ever I try to recover with holding Option key, the Start up manager shows me an unknown Lock and asks for the password that I have never set.

I have already tried to enter my administrator account password, but nothing seems to be working for me.