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[win98]

Okay this ani't about cpu but I have made a list on what you need to make certian versions of windows fly on hardware with a certian amount of ram I did not have time for cpu speed but the minum requirements are not what you want to use.
windows 3.11 and Ms-dos 6.22 16-24MB Ram
Windows 95 osr 2.5 32MB RAM use 64MB if you have the spare ram it is a minor speed increase
Windows 98SE 128MB Ram huge optimistation 96MB Ram little optimisation 64mb little as well 32mb optimsiation is a must 16mb don't even think about it
WindowsME 128mb ram more If you need sercirity software
Windows NT4 96MB 128 If you want to run lots of things at once.
Windows 2000 256MB
Windows XP 256MB Ram basic 512MB Advanced 1024MB Extream.