I have a dell inspiron 1501 my system crashed & I had to install windows xp, my vista restore disk didn't work, after going through the setup process I removed the XP disk and restarted my computer it came back on with the message that no operating system found! I put xp disk in and to my amazement windows started up and runs as long as i have the Windows xp disk in the cdrom. Can anyone help me? thank you for your help.