Restart your PC using Windows 10 Reset This PC tool.
Restart your PC using Windows 10 Reset This PC tool.
It doesn't remove every partition and rebuild them. A fresh installation is necessary if you aim to wipe all partitions, since the installer would then be on a USB drive rather than your main disk.
Free up space on a USB drive. Choose the tiniest size that fits as a bootable stick and transfer its files to a cloud service like Google Drive or OneDrive... whatever works.