Is your browser being redirected to the page trygetfree.com? Are you getting unwanted trygetfree.com ads and pop-ups? If so, your computer is infected with an adware.
Trygetfree.com is an adware that will attempt to commandeer your browser search and homepage. The adware will 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.
Trygetfree.com is usually installed through bundled software you download off the Internet or from a questionable source. Some downloads, especially the free ones, sometimes do not disclose that other apps or software will also be downloaded so you may have installed an adware with you knowing.