Last week I have installed Windows Vista Business and Kubuntu Linux on the same notebook, which has 2GB memory and a dual core processor.
Installing Windows Vista:
Including the several obligatory reboots and the experience optimization phase, the installation took me several hours. Most of the time I was confronted with a black screen without any progress indication.
Installing Kubuntu Linux:
The installation took me 20 minutes, in which I was allowed to play with the operating system that booted from the Live-CD. I played some of the included games while the installation took place in a minimized window.