Home computer builders have been buying OEM versions of XP for many years. By the terms of the software EULA, the license for an OEM copy of XP is tied to the hardware of the first computer it is put in. People get around this by telling Microsoft that the motherboard has died, and they've had to replace it. Microsoft very rarely contests this argument, and so the same software gets used over and over again.
To be free and clear from these maneuvers, you need a retail version of the operating system, which can be used many times, just so long as it is only used in one computer at a time.
So, to answer your question, the OEM version will work, with a bit of prevarication, but it is not legal in strict terms if you are not using the original hardware.
There should be some retail copies of XP floating around Craigslist, or Ebay. The only English hardware forum I visit is called Hexus.net
They have a subforum called Wanted. You might join their forum and post a thread there asking to buy a retail copy of the operating system.