How to dual boot Linux and Windows XP (Linux installed first)

Scenario: You want to install XP on your machine alongside your existing Linux installation on the same physical drive which already has Ubuntu 8.04 installed.

Tutorial Summary: We'll create space on the Linux partition to install Windows XP. XP bootloader is fairly clumsy when it comes to dualbooting and will overwrite GRUB completely. We'll reinstall GRUB to the MBR and configure it to dualboot both Ubuntu and XP.

This tutorial has been tested on a VMWare Workstation 6.0.3 virtual machine.