Start your current version of Windows XP.
Insert the Windows XP installation CD-ROM for the Windows XP version that you want to install into your CD-ROM drive or into your DVD-ROM drive.
On the Welcome to Windows XP page, click Install Windows XP.
On the Welcome to Setup page, click New Installation (Advanced) in the Installation Type list, and then click Next.
If you accept the agreement, click I accept this agreement, and then click Next.
In the Product Key box, type the product key, and then click Next.
On the Setup Options page, click Advanced Options.
In the Advanced Options dialog box, in the To this folder on my hard drive box, type the name of the folder where you want to install this version of Windows XP, and the click OK.
On the Setup Options page, click Next.
Follow the directions on your screen to complete the Windows XP installation process.