Yoga or Pilates Dvd that won't hurt my knees?

Anyone have any dvd they can recommend for Yoga or Pilates ( i have a ball) that would be easy on my knees?
I have like all of Jillian Michael's dvds and I am a runner and I try to do a video on non-running days but I always hurt my knees. They have been bad ever since I had a ton of weight sitting on them for a few years.
Crazy part is I can run up to 8 miles and my knees don't hurt, so I am just having issues with cross training!

Anyone have any suggestions?

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