I am looking for a free video joiner for Windows XP and beyond, I have done a Google search for one, but the software only works with Vista. Here is the one I am referring to, http://www.freevideojoiner.com/
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I suggest taking a look at FFMPEG:
If you cannot find one that can run on XP and your hardware will not support later editions I would suggest considering moving over to Linux.
On Windows XP and Windows 7 (at least), you could use Windows Movie Maker, included free with windows, and being able to do video joining, plus other things as well.
Regarding its availability on Windows XP: from a Microsoft forum post