My son-in-law has a WinXP, not the latest, and the original versions did not support .iso burning in the XP CD burning software (he also had some problems getting Nero to work properly). I searched and found this (download the patch from this site if you want/need this fix) at:

http://isorecorder.alexfeinman.com/isorecorder.htm

"Description

ISO Recorder Power Toy is a UI component that allows to use CD-Recording capabilities of Windows XPr to record ISO images and copy CD to CD - a piece of functionality missing in Windows XPr

The ISO Recorder itself does not record CDs but instead uses existing OS features. Some of the interfaces it uses are not fully documented by Microsoft and as such are subject to change in the future.

This software works on Windows XP only . It was tested with retail build of Windows XP (Home and Professional)"

I used this to make my first knoppix 3.4 CD on his PC; my only previous opportunity to get knoppix was when I first heard of, and was given a copy of 2.2, at a local linux install-fest a few years back.

HTH, Johnpipe