When I turn on my Dell computer it tries to go to the internet and the EULA toolbar. I then get the message"This program cannot display the website." How do I get rid of it?

See this link -- this question comes up about once a week.
https://www.askmehelpdesk.com/other-computers/toolbar-eula-49891.html

This is the easy answer complete with pictures:
Toolbar EULA: Toolbar EULA (http://toolbareula.blogspot.com/2007/03/toolbar-eula.html)