a search engine called Sendori opens every time I need to go to a new web page. I want to know how to delete it from my computer. Please help me delete this, please

I really don't care that no one has asked about this before. Please, please help me get rid of it. There are enough web pages and sites that invade a person's computer because they are tied to another site. I get so angry about this stuff because they really don't help much. I know someone there knows how to get rid of this Sendori, please help me Linda Eaton