How do i Dual-Boot Win7Ult and XP?

You think it might be a good idea to tell us which OS is already on the PC?

Follow these steps to Dual Boot Installation with Windows 7 and XP

gregrocker said:

You think it might be a good idea to tell us which OS is already on the PC?

Follow these steps to Dual Boot Installation with Windows 7 and XP

Option Two of tutorial above.

First check for all the Win XP drivers for your hardware.
You can check your HP/compaq PC here:
General XP Downgrade Guide for HP Laptops - HP Support Forum
NOTE: Please read this thread fully.

Then shrink the WIn7 partition enough for your XP partition, boot the XP CD, create and full format the partition. If the HD is not seen by the XP CD then you'll have to provide SATA Drivers - Slipstream into Windows XP CD.

Once XP starts up the easiest way now on modern hardware is to mark WIn7 partition Active and run Startup Repair - Run up to 3 Separate Times to restart Win7, then install EasyBCD (click Download - no Name or Email required) to add XP on it's Add OS Entry tab. Accept offered XP boot files, Save, reboot to Dual Boot Menu.

Good work.