After experimentation and installing & removing different OSs my partition table looks like> enter image description here
I want to completely reinstall windows, with there being no association between the current windows OS to the new windows OS i.e. no windows.old folder when I install windows on the same partition there is a windows OS on. I also want the unallocated space to be allocated to the C partition. I also have a problem when I boot my computer with some grub bootloader that is annoying, which partition do I remove to remove it? Ideally, I would want to wipe everything and just install a completely fresh windows OS with no association to the old and no special bootloaders. How would I achieve this?
When I install windows from a fresh usb, I can only choose the current C partition leaving the unallocated space unused, and leaving the other partitions which I assume one of them is the grub bootloader.