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Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
not to be an alarmist, but whenever i hear " suddenly my files are encrypted"
You may have contracted ransomware or cryptoware ( viruses ) ..
If you have any backup or external drives, disconnect them now. Time is of the essence unless this was some random error that encrypted your files, and either way it wont pay to take chances.
To get started, I need to know what type of computer you are using, a Windows XP, Vista, Windows 7, Windows 8, or Windows 10