Simple-finder.com is a browser hijacker that will attempt to commandeer your browser search and homepage. You will notice that your browser is making connections to https://simple-finder.com.
Once connected, it will load a JavaScript into your browser. It will send you to malicious websites to get money from you or display unwanted ads while you are browsing. It may also prevent you from changing your settings back.
Simple-finder.com is usually installed through free bundled software without you knowing. It is the browser extension or add-on from the downloads that is performing the redirect. Remove it immediately to prevent infecting your computer further.