Need help screwing with partitions

I had three partitions on my computer:

a Windows 2000 partition       (ntfs) (hda1)
a Kubuntu partition            (ext3) (hda2)
a Kubuntu swap partition       (swap) (hda3)
{}  (blank)                    (n/a ) (hda4)
 L and a Windows XP partition  (ntfs) (hda5)

I Booted into a Kubuntu LiveDVD so that I could use GParted to erase the Windows 2000 partition and use it as a media partition.

I reformatted the win 2000 partion (hda1) into ntfs, but it was set as the active partition. I thought that if I used GParted to set the active partition to the Windows XP one (hda5), then I could boot into windows xp and move over all my media to the now-blank partition.

But when I get into the boot screen and I try to boot into windows I get an error message saying "Some systemfiles are missing, insert a system diskette to continue". Or something to that effect.

I can still boot into Kubuntu just fine, I just want to be able to boot into windows XP.

I don't think you should tell Linux that you're fucking around with Windows.