I'm gonna say what I was gonna say even though some people have already said it. If your joints are hurting a lot, it is going to be best to run in a large park or a nature trail or something like that. The concrete is just terrible on the joints. Also, it may have something to do with your weight (if you're overweight). My brother had some problems with joint pain and shin splints because of the stress of his weight. His muscles and joints just weren't used to that motion so he was in a lot of pain. If you're not overweight, then it may be some sort of tendonitis (like many have said) or even ghost pains. I mean, I've been a runner for a while now and sometimes, there are things that are annoying, but you're perfectly healthy. I remember running where the arch of my foot would hurt for about 10 minutes at random points in my run and then it would go away. There was no basis for it to do that, but it would. I also kept sprinting on an impacted ankle though, so don't listen to me when it comes to taking action about your body

So important things: 1) find new running trails or track - not concrete. 2) Stretch before you start your run. Also, find a long enough trail that you start slow the first 10 minutes and then maybe stretch. That always made me feel best. 3) Don't run if you feel like your stride is off because of your knee. Favoring one leg, especially while running, can damage more than you'd like. 4) RICE is an important concept, for all runners. Ice is great for keeping injuries at bay, so don't hesitate to ice your knee 15 min on, 15 min off, 15 min on, 15 min off. Leaving it on for longer than 15 minutes, I believe, isn't good for anything and can actually damage cells. 5) Just keep at it. The knee thing is going to be discouraging, but just keep your goal in mind. I hope everything works out for ya, man. If you have any questions, swing a PM by me.