There is no help. You will need a new drive to install clean from scratch. There is support for this but its not free.
You need to provide a more specific of what your are doing and how so we can follow the procedure.
Start by giving the exact model number of your system and what OS came with it originally.
I suspect he may have one of the low-budget laptops with the 32 GB hard drive.
Those are a bear when updating Windows 10.
But without further details it is hard to know for sure.