The presence of ad.yieldmanager.com program on your computer is a good proof of availability of certain adware application which has obviously attacked your browser. As a result, you eventually would encounter the large number of ads displayed together with search results. Apparently, the very home page of your default browser and the search engine have also been modified by some nasty browser hijacker which works in conjunction with ad.yieldmanager.com. This article explains how to get rid of this adware from your system.