Ignoring the culture of your workplace for one minute I would say that a big problem for you is that you really think those are honest questions, and they're not. Those guys were all you at one point, and there are a great deal of things going on in their lives that they feel returning the machines is easier b/c troubleshooting them is a less valuable use of their time than just ordering something else. If you really care, this should tell you something about them, and your response to it should be to leave it alone, I assure you that will work itself out in a near-future, just not right away, which brings me to...

The culture of your workplace is bad, super-bad even. If everything you say is to be taken at face value and you are the only one willing to put in the time troubleshooting an issue then what's happened is those guys have most likely been worn down by the bureaucracy of their environment. I'm certain, b/c it's the nature of things, that they were like you once, or at least half of them were; excited about technology and what's new. Another commenter made the point that if you are in a workplace that is still forcing XP images onto more than a few sparse machines then there are much bigger problems, and again that should tell you what happens to people in that place long term.

Almost no one is going to start out with that attitude, so if you really care about them, or at least about the culture you're working in, you should think much harder about how did they get this way; not why won't they learn anything new now. It may mean that you need a 5 year plan that involves you getting all the experience you can and then leveraging that to get a job somewhere else, or it's almost certain you will be just like them in 10-15 years.

Don't judge the people around you, learn from them. Try to empathize with them and it may really prove out to be the most valuable thing you have ever done. It is a good idea to find people who you want to emulate and to look up to, but it can be even more valuable to find people around you whose fate you are desperate to avoid and try to discern what happened then don't do that.

I wish you a lot of luck! In closing, you really sounded like a jerk, and I don't think you meant to, so re-read your post and try to think about it from another point of view.