Does your homepage always get redirected to SearchConvertersBox when you open it? If so, a browser hijacker is causing this. SearchConvertersBox will attempt to commandeer your browser search towards a fake one. Its search results will send you to malicious websites to get money from you or infect your computer further. It may also display unwanted ads and will prevent you from changing your settings back.
The browser hijacker SearchConvertersBox is usually installed through bundled software without you knowing. Remove it immediately before it will further damage your computer.