The best and easiest way is to first backup your files and setting from Windows 7 using the W7 Easy Transfer Wizard to an external drive/usb stick or dvd.
Reboot with your W7 dvd, use custom install enter disk tools and either format both partitions if you wish to keep both partitions, or if not delete both and create one new one and reinstall W7. If you are keeping both partitions after format install W7 on the first partition.
A clean install will save you problems in long run, although you will need to reinstall your programs, the W7 Easy Transfer Wizard can be used to restore your files and settings.
Update. I just managed to change my HD from a logical drive to a primary. I also made it the Active partition.
After all this, what all do I have left to make Vista disappear forever?
I haven't rebooted since making my 7 partition active. I am scared to do so as I've been reading that it may make my system unbootable. How do I move the boot records from my Vista Partition to my 7 Partition so that I can reboot with 7 being the active partition?