These Ads Keep Popping Up?

I've been on different websites today tryinng to figure out how to craft different items on minecraft (i'm used to PE version) and these ads keep coming up. It says internet explorer blocked a pop up. This never happened before so I stayed off my laptop for safe keeping. Is this a virus? I've never had a virus before. Also when I tried going on my computer, the screen was pink (my backround color) and I had to restart my laptop 3 times for my desktop to come on. Is it safe to go on my computer?