Earlier this year, Microsoft pushed out an update for Windows 7 that, when installed, would cause systems running CPUs without SSE2 support to blue screen. The company said it was "working on a resolution" however, a few months later, it appears that resolution is to "buy a new PC".
In the notice, Microsoft said it was "working on a resolution" and would "provide an update in an upcoming release".
It seems the company decided it was easier to just drop support for non-SSE2 chips instead, going by a KB article dated May 8:
Symptom: A stop error occurs on computers that don't support Streaming Single Instructions Multiple Data (SIMD) Extensions 2 (SSE2).
Workaround: Upgrade your machines with a processor that supports SSE2 or virtualize those machines.
That's quite the workaround.
But let's be honest for a minute: who does this impact exactly? Probably no one you know. Or anyone the people you don't know know.
To be specific, you'd have be rocking a Pentium 3 or Athlon XP, the last mainstream processors lacking SSE2. Everything from the Pentium 4 and Athlon X2 up is right as rain.
Still, Microsoft should probably update the system requirements for Windows 7... just in case.