I am not sure which update it is that fixes this problem. But you are correct that it is a Windows thing. Wonder if you could download one update at a time and see what it is, then uninstall the others. Dunno.
These are the updates that came out in August.
KB890830 (Malicious software removal tool)twice
These are September.
KB890830 (Malicious software removal tool)
I would guess it is one of these.
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If your equation requires either a complex combination of variables to get the desired result OR you can't seem to get the result regardless of the variables....it ain't your variables, it's your constant.