Problem with YouTube Videos and Windows Vista?

I’ve been having a problem with YouTube on my Vista laptop for about two years now. When I go to view a YouTube video, it will load and play roughly 1/5 of the entire video; after that, it completely stops the loading process. If I click anywhere it hasn’t loaded, it will play for about ten to twenty more seconds from that point, but eventually stops as well. I know this is not an issue with my cookies/files/available space/whatever because it has been doing this with YouTube since the first day I bought this laptop (and this laptop is not previously owned). I don’t believe it is a Flash issue because Flash videos work fine on other websites. I also do not think it is because of high traffic on YouTube (YouTube being clogged every time I try to view a video for the past two years seems highly unlikely). I’m clueless as to what the issue may be. Help, please?
And it is not because I am impatient. It doesn’t matter if I wait two minutes or two hours, the thing won’t load/play.
Sorry, I forgot an important factor. I use both IE and Opera, and it does the same exact thing on both.

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