This is the easiest way, no doubt: (Involves no Partition Magic, and only two or so minutes in DOS)
Get a Windows 98 bootdisk, if you don't have one, you can get one from www.bootdisk.net
Boot from this floppy disk, if asked, choose to boot without CD-Rom support. At the command prompt type 'fdisk /mbr' and press enter.
Now take the floppy disk out and put your Windows XP CD in the CD drive.
Reboot now, and the XP setup will load.
After you have accepted the EULA and all of that, you get to the part of the setup that lets you make and remove partitons. Remove all the partitions on the hard disk. Now that you have one empty hard drive with no partitions, just create one large NTFS partition, and the installation will continue.
(I never understood why people try to remove all their partitions with Partition Magic before installing Windows XP, as the Windows setup can do this for you!)
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