How to boot windows 10 from a USB and keep personal files?

[52HIDER]

Firstly I apologize if this is the wrong place to ask a question like this.

I am trying to boot my laptop that will not boot windows 7 due to some kind of corruption.

Ive downloaded the ISO of windows 10 and manged to install it onto another laptop using a USB but not with personal files kept.

When I select the option to install windows 10 but to "keep all personal files and settings" it brings up a message:

Compatibility report

The computer started using the Windows installation media. Remove the installation media and restart your computer so that windows starts normally.
Then, Insert the installation media and restart the upgrade.

My question is how can I do the above when I need to select the option to boot from USB whilst my computer is booting?

Again sorry if this is the wrong place to ask

Kyle.

 

[nTrud3r]

Download Ubuntu onto your USB and boot into that (there's no need to install anything, just run it off the USB) then backup any files you need, then invest in a cloud-based back up service.