Download the free version of MiniTool Partition Wizard from the official website and install it on a working computer.
Once the process finishes, you can plug this USB into any computer, enter the BIOS/UEFI menu (usually by pressing F2, F12, or Del during startup), and boot from the USB drive. You can now manage partitions without booting into Windows.
Partition Wizard Portable is compatible with most modern Windows operating systems, including: