Yes, if you use the XP Home CD that comes with your Dell Mini, you can reinstall it if you supply your own external USB CD/DVD ROM drive. You can then use the key from the COA sticker on the bottom of the laptop. Since Dell OEM key doesn't require XP activation, you can install it as many times as you like. I would recommend you download all the newer and updated drivers from Dell's support web page instead of using the supplied driver CD, as those drivers are already outdated. There is also a new Bios since A00.