This is a problem with the website being visited and not with your computer. So far most indicators point to iGoogle being the culprit for why this has become so popular but I have been unable to reproduce the error on Firefox, Chrome, or IE8. IE6 or IE7 may be to blame. The suggestion solution is then to update your browser to the latest version or consider switching to another browser for the time being like Mozilla Firefox or Google Chrome.
Given iGoogle’s Gadget-based approach, the cause of the problem is likely a bug in a popular gadget. Since the browser locks up before a gadget can be deleted when visiting the iGoogle page, you can try removing the problematic Gadget directly through the iGoogle Settings page: http://www.google.com/ig/settings There are also iGoogle Troubleshooting steps from Google to follow if the problem is still occurring.
If anybody is experiencing this issue, can you please confirm what operating system you’re running, what browser you’re using, and what site you’re visiting when these problems occur?
Update: Thanks to commenter, Sam. I can confirm that TVGuide.com is the source of the Stack Overflow error message which is still occurring. If you remove this gadget, the error will also go away.