When downloading Xen or Xen Cloud Platform you get an iso which I initially tried loading on my usb stick using unetbootin which is my typical go-to for linux installations. However, I was having troubles and wasn’t able to boot into the installation.
1. Open the usb stick and in the root rename syslinux.cfg to syslinux.old
2. In the folder boot/isolinux, find and rename isolinux.bin to syslinux.bin, isolinux.cfg to syslinux.cfg
3. Go back and rename the whole folder isolinux to syslinux