couldn't install update of windows 10 pro

[deadlyghost_590]

i couldn't install only one update of windows 10 pro 32 bit build 1511. the update is Cumulative Update for Windows 10 Version 1511 (KB3140768) after restarting my computer it says couldn't update your computer undoing changes .i have tried it 2-3 times but it shows same error

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