Windows XP help - Play some, can't play others

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Shane
-----Original Message-----
New computer has pretty much the same programs as last
but when I go to a website that offers different videos
from different companies, I can play some but not
others. Used Windows Media Player on last computer on
the same website and had no problem playing almost all
the videos. On this new computer, also with Media
Player, I can play some but others won't play. When it
won't play Media Player doesn't even open; I get a blank
web page with the small square symbol in the upper left
hand corner while the rest of the page is blank. In the
square are a very small red square, blue triangle and
green circle. Thanks for your help.
.