A couple of months back I started C25K but at the end of week two I developed bursitis in both knees, ended up on crutches and didn't leave the house for three weeks. Oh what a lot of fun that wasn't.
Anyway, after my knees got better, which took about a month, I started daily squats and knee-strengthening exercises and now all is good.
Today is my 40th birthday and I went to Up & Running for a gait analysis (I'm neutral) and bought a pair of Brooks Ghost 10 running shoes with my birthday money. I just did week 1 run 1 of C25K again and it absolutely hammered it down. I got SOAKED. But I loved it and my new shoes are amazing. I sloshed past all the people sheltering under trees and bridges, foot-slapping rainwater everywhere as I went, grinning like a fool. It felt great!
I'm going to continue with the knee exercises and right now I'm up to 100 squats a day. I'm thinking I'll repeat the first couple of weeks of the programme twice, nice and slow and steady, to make sure I don't anger my legs again.