Hello, thank you for replying

I followed all steps on that tuto but the problem wasn't solved.

Which media release of WIndows 10 are you using?

See your other thread.

www.dell.com/.../SLN301036

Depending on where and when you obtained the image, you may want to download a newer build.

www.microsoft.com/.../

I download it from the officiel website of microsoft

I want to instal windows 10 pro N x64bits

ok i'll try

Try installing the version from the Dell link above.

You will need to reset the BIOS to the way it was before (if it was a factory install, likely UEFI and Secure Boot both ON).

I think that the problem is not with the windows version

but with the laptop, I have the windows installed on the SSD but it wont start from it.

this problem appeared when i updated my BIOS to the last version.