It sounds like you're facing an unusual issue with Firefox and the messenger window on Windows 7 RC. Let's try to troubleshoot this together. Here are a few steps you can try to resolve this issue: 1. Update Firefox: Make sure you have the latest version of Firefox installed. Sometimes, updating the browser can fix compatibility issues. 2. Check for Windows Updates: Ensure that your Windows 7 RC operating system is up to date with the latest patches and updates. This can help address any underlying issues. 3. Reset Firefox Settings: You can try resetting Firefox to its default settings. This can sometimes resolve unexpected behavior. To do this, open Firefox, go to the menu, select Help, then Troubleshooting...