Windows 8.1 asking to enter a password without setting it
Recently I have upgraded my Sony VPCEG1BFX/W 14 Inch VAIO Laptop from Windows 7 to Windows 8.1. I thought everything would go well. After upgrade of that I restarted it and strangely the system is asking to enter password. But for windows I didn't set any password.
I don't understand which password I need to give and how it is asking me to give a password? Anybody faced the same problem before? Could somebody tell me how to solve this issue? Thank you so much for reading and helping in Advance!