For my mom's 98 computer, we had to reinstall it I'd say every 6 months. We haven't done it yet, but you can tell it's begging for it. As for my Linux comp, I'd reformat almost every other month, but that was because I kept on trying new distro's until I hit Slackware which I've stayed with for about 6-8 months now and I intend on keeping that comp with that till it dies.
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