When setting up a dual-boot computer or even simply a new Windows computer: 1. Have a Linux Live CD/DVD/USB handy. It’s almost guaranteed that you will need it even if you’re only installing windows. 2. Save the MBR (“Master Boot Record”): Boot your Live linux and in the terminal type: sudo dd if=/dev/sda of=/some/path/your-mbr-backup-file bs=512 […]