Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
Live Chat is an adware spyware that continuously shows fake warnings saying that "Windows Firewall detected suspicious network activity on you PC". These warnings offer to download certain "security" software. Once the user clicks on such a warning, Live Chat opens a predetermined advertising web site, which provides adware installs.
Technical details (How to remove Live Chat(pop up))