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Common Windows Update problem resolv

Run these commands from a Administrator command prompt:

sc stop wuauserv
sc stop bits
del /f %windir%\softwaredistribution
sc start bits
sc start wuauserv

Finnaly if it needed, run update immediately:
wuauclt.exe /resetauthorization /detectnow

Other solution:
net stop wuauserv
REG DELETE "HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update" /v LastWaitTimeout /f
REG DELETE "HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update" /v DetectionStartTime /f
Reg Delete "HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update" /v NextDetectionTime /f
net start wuauserv
wuauclt /detectnow

(In WSUS enviroment delete WSUS client ID before start bits and Auto Update service)
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v AccountDomainSid /f
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v PingID /f
reg delete "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v SusClientId /f