Apple released Boot Camp 2.1 for Windows XP Service Pack 3, Windows Vista 32 and Windows Vista 64.
This update addresses issues and improves compatibility with Microsoft Windows XP and Microsoft Windows Vista running on a Mac computer using Boot Camp. It is highly recommended for all Boot Camp users.
Important: Installation of Boot Camp 2.1 is required before installing Windows XP Service Pack 3 (SP3)
Boot Camp is a Apple's tool to allow Intel Mac owners to boot dual boot Windows alongside Mac OS X. Running Windows under Boot Camp provides you with a fully compatible Windows environment.
This new version of Boot Camp is required for compatibility with Windows XP Service Pack 3 which was recently released to manufacturing and should be available for download next week.