You don't need to convert anything to Quicktime. Just make Quicktime your default movie player for your browser.
It's been a while since I've used Windows personally but you should check out "Internet Options" in your "control panel" I believe, and see if you can change it there.
You might also want to go to the Divx website and grab the Divx codecs since a lot of higher quality videos require Divx.

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