Ultimate Boot CD

How to undo everything that I had done The problem is after I run the ultimateboot Then i reboot and my xp can't not open the login screen After the blue screen I will get these message: Disk on: "press [enter] to boot the ultimate boot cd … Boot:" Disk off: "DISK BOOT FAILURE, INSERT...

First my xp can only run on a safe mod But after I used ultimatebootcd It turn out that my xp can't start and can't even go back to safe mod (it will turn to ultimatebootcd when I turn it on, even when I take the disk out) I don't know what did i doing wrong So is there any to go back to safe mod or...