I am very nervous! I believe some hackers have attacked my computer and took control over it. The problem is, I cannot open my files! They are worthless now. I cannot open and play music, or view my photos. I spotted a suspicious file that said my files were encrypted and that I need to pay 13 bitcoins for someone? What the hell does that mean? I am not going to pay money for some suspicious cyber criminals! Can you tell me what am I supposed to do in this situation?