Why can't I watch videos on my laptop, iphone and ipad?

I love to watch videos on the internet.lately it seems like the videos I watch, (usually youtube, MTV, even videos from yahoo websites) never play consistently. They always stop and it says buffering, and then starts to play and then buffers again. It is very frustrating because a 5 minute video takes 20 minutes to watch. It makes me really angry and impatient.

What could be the problem? Is it the websites themselves? I'm connected through the wireless connection I have at home AT&T DSL, maybe its the provider or the router? I believe MTV uses Adobe Flash and also I was just trying to watch Chef Fabio on yahoo and of course it was buffering then it stopped and displayed "Adobe Flash plugin has crashed" WTF! Maybe I need to install software?

Please help, I also take online classes and I'm required to watch online videos. I can't take this anymore!

Added (1). Also, I'm aware that iphone and ipad do not support Flash. But I still have problems on these devices when watching videos on youtube.

I have the same problem a lot. It's never really gotten to an unbearable point, so I've never tried to fix it. If it isn't that bad, then don't bother going about trying to fix it. If it's as bad as u make it sound, then start by updating all of your software (Java and all that stuff). Maybe you watch videos in a place where your wireless signal is weak. Could be a router problem (I suspect this problem with my issues). I'm no expert, so I suggest asking more informed professionals. There will always be people who know how to fix these sorts of things. Maybe talk to your provider and have someone come out if you're lead to believe that might help you. Sorry if I'm no help, but good luck!

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