The new ProtectionBar adware program issues false security warnings that can alarm users into purchasing a license.  Users are better served by using a mainstream anti-spyware product (e.g., Webroot, McAfee, Defender, etc), rather than using toolbars or "free" plug-ins that may not provide good security protection.

ProtectionBar - Panda warns on new adware program designed to trick users 
http://www.pandasoftware.com/about/press/viewNews.htm?noticia=7619
 
QUOTE: Panda Software warns of a new adware program called ProtectionBar, which tries to trick users by installing false security programs on their computers. These programs inform users that their computer is infected by threats that do not exist or show fictitious errors. Then, they threaten users so that they buy the license in order to delete the malware supposedly detected. The aim of this system is to earn a profit for the developers of these programs, who will share it with the creators of ProtectionBar