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[Hayley3029]

Windows 10 Packard laptop no usb or disk. Advised to do full reset and when restarted has come up saying it can't find an operating system. I can access manager boot and setup but no idea if that helps...

 

[Colif]

Full resets seem to have a habit of removing everything. Its why I would just fresh install instead of using the option.

On another PC, download the Windows 10 media creation tool and use it to make a win 10 installer on USB

I would suggest a fresh install
change boot order in BIOS so USB is first, hdd second
boot from installer
follow this guide: http://www.tenforums.com/tutorials/1950-windows-10-clean-install.html

when you reach the screen asking for licence, click "I don't have a key" and win 10 will continue to install and reactivate once finished

On the screen where you choose where to install win 10, if it gives you an error about GPT drives, delete all the partitions on the hdd and press next. If it still gives error, cancel out of the installer and restart PC and start installer again, it will accept next on that screen this time (some PC just need a restart here)