OK,
Power Clean - There is a mountain of stuff to go over. I am only going to hit on a couple of things.
1. What are you doing before you do the clean? It looks like you are having some sort of spasm.

I will advise on that when I know what you are trying to do.
2. Don't move your feet. you are not doing a jumping jack, a clean is up and down.
3. Keep the bar close to your body.
Just start with those things on the clean. There will be a lot more to learn after that. But, you have to start somewhere.
Squat - You squat is decent, it looks like you just need to do a ton more reps. Pull your elbows forward and get your back a lot tighter. Aside from that it is really a style thing. Make sure you squat using different foot spacings. You will find a stance that is most comfertable. (if you haven't already)
Front Squat - Keep you elbows up higher, especially at the bottom. Just do a million more reps and you will have a good feel for it.
Deadlift - this is not bad either. Your hips rise up before the bar moves much on a couple of reps. I do not see a problem with the lockout. Keep your head in line with your body. (that is true for all lifts)
Overall you need to do these exercises for tons and tons of reps. That will get you the practice you need to really get a feel for them.
Where do you live at? There has to be somewhere you can go to get some live help from a coach of some sort. Specifically on the clean, you need the most help there and the best bet is going to be find a coach in your area.
Hope this helped.