After Microsoft entered the gaming world, their PC sales weren't hurt at all. Obviously they were a PC company first, owning both DOS and Windows. But I don't think Nintendo making any kind of PC would be a good idea. They don't need to branch out into that market. If they did, then unless their PC's were completely unique they would have to run on Microsoft systems as well, so Xbox would profit off it's competition. Or they would have to run on a Mac, which would severely limit the consumer base that would even be able to play the games. It would cost them more than it would profit them. And if they did come up with a PC, they would have to come up with an OS, and a user program like Windows or Safari. It's just not a good idea for them to do it.