EZTV's reputation seems to have tanked, based on a quick search, because of junk like that and other reasons. There seem to be a lot of variants that may just be using the name and not be related, or some may be different proxies for the EZTV Group at the site you were using, which is what did a hostile takeover of the original EZTV (now at
https://eztv-official.site). It's enough to make me not want to touch anything with any variation of the name because you have no idea which one you're using.
When you say it was on "the tool bar" what are you referring to? The bookmark toolbar in the browser? If you deleted it, then it's gone, there was nothing "installed". Make sure it's not a saved bookmark elsewhere in that browser or others (since Edge likes to import without asking, and others may have imported when installed), and go into the history and delete all instances of the site so it can't be found there. That won't stop them going to a search engine and looking for it, though, and in most browsers just typing it into the address bar will do a search, so make sure to TELL them not to use it anymore and if you can't trust them not to then they shouldn't be allowed to use the computer.
You can also modify the HOSTS file on the computer to "block" the domains associated with it, but honestly if you can't trust them, keep them off the computer.