It could be a number of problems, it may be specific to a version of IE. I tried it here on Vista/IE8 without getting a problem.
It could also be related to just your browser, locally; do you have any browser plug-ins installed that could be causing the problem? anything relating to web development & testing thats integrated into IE? It could be related to Flash in some way, have you got the Flash development environment installed on your machine? maybe theres a version mismatch there between the plug-in and the environment.
If you've got some javascript written into your web site also check this out, what you think looks like a crashing website might just be some busy javascript stuck in a loop.
Tracking down the problem requires lots of helpful people like me to check the website on their computers, to see if the problem is just you or more widespread ;-)