
The reason why the browser settings change is because you most likely agreed to that during the bundleware install (without realising it, of course).

Moreover, you might notice that your default new tab page URL changed to one of the said sites as well. In this case, your regular search engine might be switched to cause regular Bing redirects, Yahoo redirects or Yandex redirects. Programs like Adaware Web Companion often change web browser’s settings without user’s knowledge to promote a specific search engine or a website. Users often install such software bundles without noticing statements about extra programs included and later notice changes in computer or browser settings that they did not initiate, which causes stress and confusion. In other words, the discussed application is promoted via installers of other freeware programs. In fact, Web Companion is distributed using a Bundle Installer, which is made to push a bundle of programs for the user. However, due to its marketing methods and possibly other reasons, several reputable antivirus vendors mark it as a potentially unwanted program (according to VirusTotal report) or even riskware.

Web Companion (by Adaware, previously called LavaSoft) is an application that advertises itself as software that is capable of protecting user’s computer by warding off malware and privacy breaches. Distribution of unwanted programs, explained.Users wonder how to delete Adaware Web Companion from Windows after noticing it.
