Ugh.... after that post I tested and I played a few videos and it was fine. Does it happen on ANY other web page? Do you get an error or just freeze?

Visit www.adobe.com and update the flash player.
Visit www.java.com and update the Java version.

Then try it again.

Also download a second browser, like Mozilla Firefox (www.mozilla.com) or Google Chrome (www.google.com) and see if the issue is with Internet Explorer. There may be an issue with MSIE depending on how new it is. I never moved off MSIE 7. They can keep 8 and 9 until I see there are no bugs. In fact I don't use Microsoft's browser at all. Firefox all the way.