Hp.tmapsndirections.com is a browser hijacker that will attempt to commandeer your browser search and homepage without your consent. This browser hijacker will send you to malicious websites to get money from you or infect your computer further. It will spam your desktop with unwanted ads and banners, and may also prevent you from changing your settings back.
Hp.tmapsndirections.com is usually installed through bundled software without you knowing. Remove it immediately.