Toshiba C55-B5202 asks BIOS password?

I have Toshiba C55-B5202 laptop. Yesterday when I turned on It showed Enter Password out of nowhere. To my knowledge it must be BIOS password. I searched for this in google, and I found few people had the same problem with different models of Toshiba laptops. Some people sorted out the problem by using jumpers on the motherboard.
I don't know which jumer to short in my laptop model. I had assembled PCs, so I have no hesitation in opening my laptop .Please help me. I am out of warranty.

Imrankhan mate I have been messing with Toshiba laptops for some time now and know of no jumpers in fact the last time I dealt with jumpers was on some very old XP machines and they were desktops.

Now it is possible you have been infected and as you cannot login I am suggesting you run this to check http://support.kaspersky.com/4162 you will of course need to make a bootable disk and set the BIOS to boot from the disk or stick whichever you intend to use.

I don't think the password message is coming from the BIOS itself as unless I am terribly wrong the BIOS password is used only for resetting BIOS functions within the BIOS.

Now some system specs on that machine please and please include the PART NO on the sticker on the back of the machine as it denotes where and for where the machine was manufactured for see pic
System Info - See Your System Specs

I turn my laptop on, and It says Enter Password, right after Toshiba logo. Esc, F12,F2 nothing works.