Microsoft has released an update for Internet Explorer 8 that resolves an issue in which users receive the message “A webpage is not responding” under Windows 7 RC1. Microsoft describes the problem thusly:
Windows 7 RC includes a feature in Internet Explorer 8 that helps users recover from unresponsive Web sites. This feature uses a timer to detect when a Web page has become unresponsive. On low performance computers or on computers under high load conditions, the time-out value is frequently exceeded. Therefore, you frequently receive the error message that is described in the Symptoms section.
To resolve this issue, run Windows Update in Windows 7 RC1. This will apply the fix. You must restart your computer after applying the update.