Use the following steps to configure Internet Explorer to allow third-party browser extensions to be installed, and enable the SiteAdvisor toolbar add-on:

1. Launch Internet Explorer.
2. Click Tools, Internet Options, Advanced.
3. Under Browsing, select Enable third-party browser extensions.
4. Click OK.
5. Click Tools, Manage Add-ons, and select Toolbars and Extensions.
6. Locate and select McAfee SiteAdvisor, and click Enable.
7. Select McAfee SiteAdvisor BHO, and click Enable.
8. Click Close.