"We’re going to use something called Wubi. This
is built into the latest releases of Ubuntu and lets you install
Ubuntu as a file within Windows. It makes installing Ubuntu just
like installing some Windows software. No drastic repartitioning is
necessary and you don’t have to deal with baffling
terminology.
"Once installation has finished, you just choose between Windows
and Ubuntu when you boot. If you decide you want to get rid of
Ubuntu, you can use Add/Remove Programs to get rid of it, like a
Windows program.""