Annoying Internet Explorer alert message

I keep getting this message when I’m using IE:

Microsoft Internet Explorer

A script on this page is causing Internet Explorer to run slowly. If it continues to run, your computer may become unresponsive. Do you want to abort the script? Yes/No

The computer slogs for a while after I choose either “yes” or “no”, and it keeps popping up just about every time I run a new IE window.

What is the problem here, and how do I make it go away?

The problem is that some browser embedded script (usual suspects are Javascript and/or Flash) are either going into an infinite loop or just taking a monumentally long time to process something (I would guess the first).
I would always suggest clicking ‘Yes’ and then trying to reload the page.
You say that this happens lots. If it is happening regardless of the site that you go to I would do a scan for adware, spyware.
There are plenty of threads on the board already that will tell you the best software to use for this (search for AdAware and SpyBot).

Spybot fixed it. Thanks.