cant update to windows 8.1 from windows 8, all drivers and software updated. using avast anti virus 2015. please help

whiteboy1793

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Feb 9, 2015
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i've had my Fujitsu Lifebook AH532/G21 for over a year now. it has a corei7 processor and a nvidia gt620m with all drivers updated. i am currently using avast premier 2015 for my antivirus software. i have tried over a dozen times by now, but still no luck. it installs the updates and when the notebook tries to boot up it shows the BSOD and indicates that the update was unsucessful. after which the previous version of windows 8 is restored. i need help please