Multiple windows open when you start Windows Internet Explorer 7 after you upgrade from Windows XP to Windows Vista

After you upgrade from Microsoft Windows XP to Windows Vista, multiple windows open when you start Windows Internet Explorer 7. Or, multiple windows open when you visit certain Web sites in Internet Explorer 7. You may experience this issue when you start Internet Explorer 7 for the first time.

This issue may occur if Internet Explorer was configured to include a trusted Web site in Windows XP. When you upgrade to Windows Vista, Internet Explorer 7 inherits the list of trusted Web sites from Windows XP.

In Internet Explorer 7, trusted Web sites and Web sites that are not trusted do not appear in the same window. By default, protected mode is disabled for Web sites that are registered as trusted Web sites. Protected mode is enabled for Web sites that are not registered as trusted Web sites.

When Internet Explorer 7 starts for the first time, it is redirected from a Microsoft Web site to the http://runonce.msn.com/runonce2.aspx Web site. This Web site is used to set various configuration settings. If you register "*.microsoft.com" as a trusted Web site, Internet Explorer 7 starts with protected mode disabled to access the Microsoft Web site. Then, Internet Explorer 7 redirects you to the home page that is set in the preferences. However, if the home page is not a trusted Web site, protected mode is enabled. Therefore, a new Internet Explorer 7 window opens.

To resolve this issue, remove all Web sites from the list of trusted Web sites before you upgrade to Windows Vista. After you upgrade to Windows Vista, you can restore the Web sites to the list. To remove a Web site from the list of trusted Web sites, follow these steps:

1. Click Start, click Run, type inetcpl.cpl in the Open box, and then click OK.
2. In the Internet Properties dialog box, click the Security tab.
3. Click the Trusted sites icon, and then click Sites to open the Trusted sites dialog box.
4. In the Web sites list, click a Web site, and then click Remove.
5. Click OK to close the Trusted sites dialog box.
6. Click OK to close the Internet Properties dialog box.

You may experience this issue in the following situations:

• You are redirected from one Web site to a different Web site.
• Inline frames are used to display a Web page that includes information from another Web site.

For more information about how to prepare to upgrade from Windows XP to Windows Vista, click the following article number to view the article in the Microsoft Knowledge Base: For more information about how to upgrade from Microsoft Windows XP to Windows Vista by using the upgrade version of Windows Vista, click the following article number to view the article in the Microsoft Knowledge Base: