Thank you everyone for the replies. I deleted the partitions like was mentioned and that put all of the unallocated space together so I only had one option there.
It was so simple that I now feel a...

Thanks very much for the replies!
I read in the tutorial about deleting each one but the delete option is greyed out for the lines with unallocated space.

Hey :) I apologise in advance if I sound totally stupid.

A few days ago I tried to do a factory reset on my laptop but it failed right at the end and I ended up with no os installed.
I used...