FULL VERSION OF XP PRO TO DOWNLOAD ?

At the moment, the only method of getting Windows XP install media is by purchasing the disc or ordering install media directly from Microsoft. The other way is if you're a MSDN subscriber, you can usually download software images from Microsoft and use your own key.

The other way to do this is by finding a friend who has a Windows XP cd of your version [for example, Windows XP Home OEM, OEM meaning that the disc came with a manufacturer such as Dell or HP, or Windows XP Home Retail, meaning that the disc came in a Windows XP Home box someone purchased]. If you can borrow thier disc, you can use your key off of your COA [Certificate of Authenticity] which is a sticker on your computer showing your 25 digit license key. This will install Windows XP legally on your system again.

If you own an OEM computer like Compaq, HP, Dell, etc, you can also try contacting support for that PC manufacturer and seeing if you can order recovery media for your computer model. This will install the operating system, all drivers, and software that originally came with your computer back to default when you bought your PC. You may also have recovery software installed on your computer. Look under your start menu and see if you have a suite of software from your PC manufacturer, including recovery software or system restore software.

Best of luck!