[Halcyon]

Yes time to install the O.S.
It is pretty straight forward and unless you have already formatted Wnidows will prompt you to format and set up partitions, etc.
Then the setup goes on its own, with just towards the end Windows asking you to set up regional settings, etc.
You've got about 45 minutes or so of waiting here so it looks like you have time for a good couple of drinks.

Rememeber once you are in Windows to install the motherboard software, graphics drivers, and any other drivers you were sent.
Then, dont forget those firewalls and virus scanners before you connect to the net.