How do you slow down a video. There is a dance i converted of of youtube but it goes to fast and i can’t keep up. Can anyone help?

I’ve noticed little things and small errors popping up like invalid so and so. So, my question is, is there a good free program to clean out the Windows registry you guys can recommend for Windows XP SP2?

do i still need to run it manually ever?

I have Windows XP and I’m concerned that a Registry Cleaner will erase important stuff. Also, are you familiar with "AML Free Reguistry Cleaner"? Thanks.