ok so long story short simply trying to reinstall Windows 10 on a disk in a dual boot setup (Linux is on a physically separate drive and launches without issue).
First issue was when using Rufus USB to install was told that the target disk needed to be MBR partition type (see Partitioning nightmare with USB Windows installation). All of my drives originally had GPT partitioning.
So I used Diskpart from cmd line to convert just the Windows disk (Drive 1 in attached image) to MBR.
But now when I attempt to install I get the following error popup.
Does this mean I cannot use MBR partitioning at all? As mentioned in previous post I’ve already disabled Secure Boot and enabled CSM in UEFI-BIOS.
Any feedback appreciated!