I'd definitely like to hear your answers to hardcore's questions. When new runners seek my advice I first probe what they consider "running". I find two common misconceptions. The first one is that they think they have good shoes. For anyone that is considering running and wants to do it regularly they need to be fit by a professional for the right shoes. Just because the shoes are found in the running section of a store that does not mean they are the right shoes for the runner. A lot of shoes are built to correct a biomechanical issue like high arches or flat feet. It's very possible the shoe that you are using could be making a biomechanical adjustment that makes your natural problem worse! So for your own sake, make absolutely sure your shoes are right. Many times stopping at a running store with quality shoe professionals can be cheaper than a trip to the dc or dr.
Secondly, if you're just starting out you could be going a lot faster than you should be. Running is defined as a gait in which at some point all feet are off the ground at the same time. It doesn't necessarily mean faster than walking though that is the case most of the time. If you have the right shoes I would suggest going SLOW. Go so slow that when you come back you feel like you could do the run again instantly. Start off with 20 minutes of this activity and gradually build up to longer times (not distance in the beginning). Plan days of rest or recovery between running days. Stay consistent and enjoy it. You'll get results with little effort.
Oh, and get a good running book. Reading running books has helped me really helped me to make running a part of my lifestyle rather than just something I do between injuries
I'm a big fan of Brad Hudson and Keith Livingstone.