Tech question

Twice tonight I've ended up on pages where I get a pop-up saying I need to update Java. There's no option to cancel. Closing it automatically loads a setup.exe (which I delete immediately without opening) and then the page goes to a warning page from my firewall to prevent my going to the website it's trying to redirect me to.

Does anyone know what's going on? Tell me I don't have to update Java.

Thanks, gang.