Cool.
enter the BIOS,
set the time and date.
set the boot order too optical drive first, HDD second, you can disable the others including search for other boot device to help speed the boot up times.
Insert the win7 disk.
follow instructions on screen to do a new install.
the pc will restart a few times, and including at the first time it gets to the desktop.
get the internet running.
windows updates.
motherboard, graphics and soun drivers in that order.
anti virus etc.
run the windows experience index to let the operating system learn the hardware, ignore the score it gives you, it will be 5.9 anyway.
Kill zombies.