This is an old post but it still works (duh); personally I find DISM way the best and painless one - you can do this even more comfortable with Disk Management

This is an old post but it still works (duh); personally I find DISM way the best and painless one - you can do this even more comfortable with Disk Management for creating disk image and EasyBCD to manage, backup entries. Windows installation will continue after reboot if you pick DISM scenario and shortly after take you to the OOBE.