If you're concerned that your computer might have a virus, you could just format the hard drive. No virus resists that, ha, ha XD
I do have a number of faithful computers to play my old DOS games, but they are all desktop PCs. I've had them for so long that I wonder how hard it may be to get one of them when I move abroad, as I don't plan on carrying my old desktop computers with me. Is legacy hardware still easy to find?