What I ask people is this: Were you using Windows 95 back in 2007? That is how absurd it is to be using Windows XP still.
Move on folks, move on.
We still use XP on 3 machines at work. They have cards in them and run software that won't run on newer versions of Windows. It'd cost $20k per machine to upgrade them to Win7, plus the downtime while the computers are upgraded and the new systems implemented to make them work. They'll get upgraded at some point in the next year or so, but it's just not in the budget or timeline to do it now.