[ubuntu] Can't reinstall Windows XP after Ubuntu install

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http://ubuntuforums.org – I've been trying to help a friend reinstall Windows XP after she decided she wasn't ready for Ubuntu, but when I boot her Lenovo T61p from the Windows XP install disk, it complains that there is no hard drive. But the hard drive is fine, and will still boot Ubuntu. I even booted Ubuntu from the Ubuntu install CD and used the partition manager to remove the Ubuntu partitions, and then retried running the Windows XP install, but still it claims there is no hard drive. Then I put the Ubuntu install CD back in and had no trouble reinstalling Ubuntu on the supposedly "nonexistent" hard dr (Hardware)