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Hi, I'm Sudipto. Welcome to JustAnswer. I'm reviewing your question now and will post back with your reply ASAP
It seems that, your PC is infected by a ransomware, which means a virus has locked your computer and when you pay the money you will get the password, but that is not the case always as there is no guarantee that, you will get the password ***** paying the money, so if there are no important files on your PC then, it will be better to reset the PC to factory defaults, you can get some more detailed information from the link below, reply me back after reading the article from the link.