Are you always getting redirected to the website Ttechu.com when you open your browser? If so, an adware is causing these redirects attempting to commandeer your browser search and homepage. Ttechu.com is an unreliable page with lots of unwanted advertisements popping on your screen. Clicking any of these ads 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.
Ttechu.com ads usually happen through bundled software installed without you knowing. You have to remove it immediately.