Noted on when to insert the USB with thaks
Cheers:)

Yes I'm pretty sure I should press Esc ... so I insert the USB, turn off the computer, turn on the computer pressing repeatedly Esc until I get the one time boot screen and choose "USB"
If I'm right...

all done and I have the ISO file on USB stick thanks to RUFUS.
not sure how to boot from it but I can see the setup file when I open it so I guess I can always reset the computer if same works and...

I'll post the results late tomorrow
Thanks again

I'll do this first thing tomorrow. Thanks again simrick

well all is well and I run Windows 10 now.
Downloaded an extra ISO file just in case but it does not fit a 16 GB nor a 32 GB USB stick and yet the file is just 4GB
Anyhow thanks again for your help...

Thank you simrick I take it I have to download this from the Microsoft site? Please correct me if wrong and thanks again
Got it now have to use the link you provide Windows 10 ISO (thanks)

Hello to all.
Purchased an HP desktop w/ windows 8.1
Ugraded to Windows 10 (free)
Created dvd disks (4) to reset in case needed
Had problems to start the computer (HPSF.exe This application...