Planning a new Debian box!

[Bob Bernstein <poobah@ruptured-duck.com>]

Shortly I will become the owner of a refurbished Dell 
with Win7 already on its 160g sata hard drive.

I have no need or use for a multi-OS multi-boot 
machine. I only want wheezy on this for now.

Question: can I entrust to the Debian installer the 
task of repartitioning and formatting the HD with all 
that Windoze cruft already on it?

Or, are there steps I ought to take prior to launching 
the installer, perhaps involving other disk tools? I 
don't trust what M$ puts on hard drives!

TIA Debian peeps!

--
These are not the droids you are looking for.