I have a problem, when i am booting my laptop it is loading and then shows a bluescreen with this title : DRIVER_IRQL_NOT_LESS_OR_EQUAL (epfwwfp.sys) and next it start diagnostic tool and it shows nothing only to restart.
I installed Windows 10 on it start day and it install good but i restart it and than it wasn't boot.
Laptop is :
HP Envy 17 - j040ec
Before update Windows 8.1
I have many files on disk and i wasn't lose it.
I need to restore to Windows 8.1 or repair Windows 10.
Thanks for help.
Sorry for my english i'm from Slovakia.
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