For a couple of weeks now, my computer stops responding after using my net browser (Firefox). It's gotten to an unresponsive state quicker and quicker. First the browser stops responding, not responding to any commands, then the whole computer does the same. I can still move my cursor, but even ctrl-alt-del wouldn't do anything. Open programs would stop responding and I would have no choice but to hard reset. I ran malwarebytes and security essentials and removed some pop-up stuff, but it didn't help the issue.
Additionally, my Firefox has barely been able to load sites with lots of flash animation and ads (the whole browser does a 'not responding' status for a while) while Chrome works completely fine. I'm not sure whether my issues are software or hardware related. Can anyone please help?