Xubuntu and Windows 2000. I prefer Xubuntu since Xfce is lightning fast in comparison to GNOME and much prettier than KDE. Windows 2000 on the other side is quite handy for doing stuff that really needs Windows (like making calculations in Mathcad or drawings in CorelDraw) and is honestly the last good version of Windows; the only thing that it's missing is the ClearType font smoothing, nothing else.