@ Pedro. best way is to backup any files that the owner wants to keep, and reformat the 2nd HDD, and restore the backed up files.
@ 16PMark: you 'sort of' cant, but depends on which exact Windows files you want to delete. Some will be locked as they're in use, so you'll get a message saying so.
But if you're 100% sure you know what you're deleting(in those Windows files) .. then best way to remove as many as possible is either in safe mode, or use a bootable USB stick environment.
Safe mode(assuming only one operating system installed) = press F8 on bootup.
If you have Win10(running), you can also find the option to do so in Settings->Update Security->click the restart, when PC restarts go to Advanced Options->Start Up Settings restart and then there'll be an option for Safe Mode.
Bootable USB stick option is the more certain method of not getting the file locked/in use issue tho.
If you have a USB stick, Google a Bootable USB stick OS, they're usually a Linux OS, you need to set you PC to boot from the USB drive option in the BIOS, and instead of booting into Windows, you get another OS where you can browse and do stuff to the storage drive where Windows is located.
I'm pretty sure that Windows also still has the ability to create a bootable USB drive using Windows to achieve the same thing.
Arthur.
'99 D1 300Tdi Auto
'03 D2 Td5 Auto
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