How to prevent windows from reopening from restart (computer can't restart)

So basically a website somehow froze my computer, completely unresponsive, I hard rest it and it tries right off the restart to relaunch the site and freezes it self right off the bat, I can't do anything to prevent it. I tried removing the battery and putting it back in but it fixed nothing. I've tried restarting multi able times but it always immediately tried to load the site and freezes its self right on restart before I can stop it.