I have never set a firmware password on my macbook pro, but when I hold down option to boot from a different drive, I get a lock, and have no idea what the password is..?

I have never set a firmware password on mymacbook pro, but when I hold down option to boot from a different drive, I geta lock, and have no idea what the password is, i am the first owner of my mac so its impossible that someone else has set the password, i have only noticed this becuae i made a bootcamp partition and installed windows onto the machine, after the installation... i shut down the comptuer and continued to use os x, days later i tried to boot into the boot camp partition again by holding down the option key on boot, but i got a window asking me for a firmware password that i have no idea of! please help me!
will

Hi macbookprowilliam, I have the SAME problem, that grey lock just appeared trolling me. I dunno the password and I wan't to sell this macbook! I need the password. Maybe it's a new malware! I don't even know how to set a firmware password and I am the only user on this computer too! I have a thread about that too: https://discussions.apple.com/thread/3926399?start=0&tstart=0
So, did you fix it or got around it? Please reply! I am desperate.
Thank you

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