Does it lock up on a specific browser on that system? Or any/all browsers on that system?
EDIT: I believe I saw this thread at another time a while back (I could be mistaken). If that's the case, then you really need to be more descriptive when talking about the problem. It's an IE issue. I see it too, now. You were told before about the graphics because people never actually saw what you meant because you didn't specify that you were having the issue in a specific browser.
In any case. it is one hell of a bug doing something. I would say most likely with IE's implementation of the JS engine most likely (purely a hunch). Remove all scripts and calls to scripts (e.g. the onload attr in the body tag) and load it up in IE to see if you've isolated the problem. If that is the problem, put the scripts back in bit by bit until you found out which part makes the browser hang.
EDIT #2: Slight chance there's something going on with the youtube embed because it doesn't show up when the page eventually does load in IE. So you might want to try taking out the embedded video too and load up the page to see if that's your problem.