Claro Search is a browser hijacker that redirects every browsing page to isearch.claro-search.com, it also displays ads to help keep the website alive and generate revenue.
It can get on your computer many ways, mainly from infected websites and also from shareware and freeware that contains unwanted programs.
Claro Search can infect Firefox, Internet Explorer, Opera and Google Chrome, pretty much every browser out there.
The moment you notice one of
Claro Search's redirections, remove it before it gets worse.