Why does Firefox 4 not open video files (news and youtube) at all, but Firefox 3 and MSIE 8 open these video files quickly, all on my Dell Dimension 8250 desktop with MS Windows XL Pro?

I subscribe to an Earthlink package of telephone and ISP through DSL in Dallas, Texas. To avoid the congestion (time outs and files not found) of the virtual "cloud" servers, as a workaround I connect to the Internet through dial-up on each session on my pc. There is only one pc or computer on my local network. I downloaded Firefox 4 RC and it failed (would not open video files on the Internet), so I removed the Firefox 4 RC program from my pc, and then I downloaded and installed Firefox 3.6.16, which works fine.
My operating system is Windows XP Pro.

Try disabling hardware acceleration. Many visual bugs can be attributed to issues with graphics drivers.
(Firefox -> Options -> Advanced -> General -> [ ] Use hardware acceleration when available)

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