Search-123.com belongs to the browser hijackers family. It can hijack your default setting of the Google Chrome, IE or Firefox. You can do few things to get rid of it if you are not good at fixing computer. It will just come back again and again and flood your screen with ceaseless ads. To the worst of all, if you believe it and search anything
in its domain, your personal data can be logged and stolen. Please close and remove it immediately under the help of the removal video here.
More video guides for similar situations: http://www.removalvideos.com/