[PROBLEM] BOOTMR is compressed press ctrl+alt+del to restart

Hey guys,

I accidentally compressed my windows drive on my Macbook Pro Retina, and the computer restarted and portrayed the following text after booting up: "BOOTMR is compressed press ctrl+alt+del to restart"

The actual problem is that windows can't seem to read backspace as delete, so I'm basically stuck in this screen and I can't go out. Somewhere else i've read that you can fix this problem with the windows disc, but as you probably all know the retina macbook doesn't have a disc reader. I've tried using USB as well, with no success.

Help would be appreciated!

Thanks in advance.