> A script on this page is causing Internet Explorer to run 
> slowly. If it continues to run, your computer may become 
> unresponsive.

Humm, I suspect a bad javascripting code, such as a 
redirect-loop.

There isn't much to do, unfortunately: some pages check if 
you access them through their host addres/url (this is a 
trick to reload all frames if you try to access a subframe 
directly) and this will fail with "local" copies.