If the drive didn't come with any utilities, just go to the drive manufacturer's website and download one (they've nearly all got utilities to clone old drive to their new one - eg, Maxtor's is Maxblast).
One other point - after you've done the copy, disconnect the old drive before booting from the new - or you may end up with a drive letter problem (if its still connected, the old drive will still occupy C: - even if its now a slave - so new drive will take D: or later. If you connect new one on its own it will take C: - and you can then reconnect the old one if you want to)