Dual Windows Booting

How to have 2 windows (XP and Vista) on your PC? First you must backup every important data you have. It's very important to do a backup in case something bad happens. Now create a new hard disk partition (you'll have 2 hard disk partitions now). Use BIOS to make CD booting the priority. Now insert your Windows XP CD, install on the first partition. After windows XP installed, put in Vista or other operating system software and reboot. Install on the 2nd partition. After successful installation you'll have 2 operating system on your PC!