While having installed Linux on a partition on the disk of your PC, you have kept the Windows XP partition. If you delete only use Linux for Windows XP, you see that message, now useless, you always choose an operating system at startup. Indeed, the deletion of the Linux partition does not remove the software to boot, on a special area of the disk area called boot. But when you turn your PC on, it's the software that starts in first: it scans the boot sector of your hard drive and lists all operating systems that are installed. You are then asked to choose one of them.
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