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PC login problem

HP Recommended
HP EliteDesk800G2TWR
Microsoft Windows 8.1 (64-bit)

Hello everyone! First of all, I don't know what happened but when I want to sign in to my HP EliteDesk800G2TWR (in HP Drive Encryption) it says "TPM authentication failed (0x1)" although I remember my password. I need help and fast because I am using this PC at my office. So what to do? 

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