Windows XP

Windows 2000 after a facelift. The Professional variant is a decent, robust OS with very few nagging points (provided that you disable all of the extraneous garbage and useless services). The Home Edition variant, however, is crippleware aimed solely at the computer illiterate soccor mom who couldn't tell a mouse from her studded leather dildo; contrary to popular belief, it is crash-prone and becomes very unstable when running more than 2 applications at once. It's "Luna" theme, by the way, is a laughable ripoff of Apple's "Aqua" design theme that is nowhere near being as elegant and intuitive. I don't like Macs very much, but I'd take OSX's svelt brushed metal and blue orb design over Windows XP's clunky blue-and-red coloring book design ANY day.