Pop-Up Blocker does not stop:

• Instant messaging windows
• Error windows
• Flash or DHTML windows within the browser
• Windows that open because of software or adware on your computer (like Gator and WhenU.com)
• Windows opened by the Windows OS providing you information about your OS (disk full, network disconnected, etc.)
• Feature tips provided by the Yahoo! Toolbar

Click here for more information on protecting your computer from pop-ups not stopped by Pop-Up Blocker.