Site Guard is available as an add-on and can be downloaded here: http://www.pctools.com/spyware-doctor/addons/

As you browse the Internet, Site Guard will block access to known malicious websites masquerading as legitimate eCommerce sites and prevent tracking cookies from being stored on your computer. These sites may be designed to steal your personal information or to distribute spyware.

Site Guard monitors and blocks the following:

• Downloads from suspicious sites
• Suspected spyware sites
• Phishing sites
• Malicious cookies from all browsers