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#31
You really do need to make a bootable DVD or USB. You boot from that. Select the Custom Install option and then I think "advanced" and it will show you all your partitions on the hard drive/SSD. You highlight each one and delete all the partitions one by one. Then you highlight the unallocated space as where you want to install Windows and setup will create all the partitions it needs.
There is no need to use any external program to delete partitions or format the hard drive first and no need to use the command prompt in Windows setup. It can all be done very easily with mouse clicks in the Windows setup GUI.