Is your browser getting redirected to the Russian search engine 1stserp.com? If so, you may be infected with a browser hijacker. The browser hijacker, 1stserp.com, will attempt to commandeer your browser search and homepage. The virus will display loads of unwanted ads, 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.
1stserp.com is usually installed through bundled software without you knowing. You have to remove it immediately before it does further damage.