The early days of Windows 11 and its hardware requirements were simply a mess. According to a new potential discovery, the upcoming Windows 11 24H2 might be a little simpler — older PCs simply won’t boot. And by old PCs, we mean old PCs. A Twitter user claims that he has discovered a hard stop on PCs dating back to the last decade, based on a CPU instruction that’s now required. The instruction in question is POPCNT, or population count. Why Microsoft’s Windows requires this instruction isn’t known. What we do know, however, is that POPCNT debuted 15 years ago in 2008 as part of the Nehalem ar…