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Hi there! My name is*****'m sorry that you're having this problem. It would be my pleasure to assist you. It sounds as though you have been infected with Ransomware. I can provide instructions that MAY help you to remove it, although I can't guarantee anything. This is probably related to the wannacry ransomware attack that disabled computers in several different countries last Friday.
In order to provide the best possible help, I will need to know what operating system you have on your computer. If you're not sure, please click this link and tell me what you see: