0x8004fe21 Windows Validation Error. My windows update doesn't work.

First of all the MGA diagnostics: Diagnostic Report (1.9.0027.0): ----------------------------------------- Windows Validation Data--> Validation Code: 0x8004FE21 Cached Online Validation Code: 0x0 Windows Product Key: *****-*****-2QWT6-HCQXJ-9YQTR Windows Product Key Hash: PVjSC5x6njvqunmbCY3lOD7rYDo=