New Runner, Sore Knees

Hi Runners!

I recently lost about 40 pounds (268 - 222) so I figured it would be a good time to start exercising again. In addition to other activities I started jogging/walking 2 miles a night. After a couple weeks I was able to run the full 2 miles each night, albeit slow runs (13 min/miles) still.

The past several days my knees started really aching on the inside of each kneecap. Tonight it was sore enough to prevent me from actually jogging, which my dog was happy about, I'm sure.

Any tips for a newbie? Thanks in advance :)