Definitely XP for legacy apps and...
Windows Seven is quite sluggish in my computer. I honestly now don't see much difference as compared to Vista.
In XP, I can run 3 simultaneous instance of a software (program eats 350-650 MB) RAM. In Vista it won't cut in 2 (it opens but not workable), and in Seven (Seven 7048) it just dies and BSOD in my attempt to have 2 instances.
I have 4GB RAM (Actually 3GB since I am stuck with 32 bit versions).
One of the biggest bullshit I have ever read.
At 4GB RAM it would run MUCH more program than that, as we speak I am running Word, Paint, Excet, Chrome,
IE8, Live Messenger and Opera all at once.
I have 2GB RAM and no slow down.
P.S Using Windows 7