Getting redirected to the website – posukach.com? If so, a browser hijacker is causing these redirects. Posukach.com will attempt to commandeer your browser and homepage towards a rogue search engine. Search results will insert ads and send you to malicious websites to get money from you or infect your computer further. It may also prevent you from changing your settings back.
Posukach.com is usually installed through bundled software without you knowing. Remove it immediately.