Getting Error message "BootMGR missing Press Ctrl+ALt+Delete ... etc"

I ran into a problem when trying to run the install. I am able to get it to try and boot from USB but I get the message "BootMGR is missing Press Ctrl+Alt+Delete to continue". I ama running windows XP SP3 on a Dell. I have tried the process twice, and downloaded the ISO twice to make sure that wasn't the issue. Any suggestions?