I've been experiencing the same issue that everyone else seems to be reporting. However it sounds like going to windows defender was the fix? I have windows 10 and windows defender system and I can't use anything. Right now the only thing that works is I get mail thru gmail and that's it. Google comes up and looks like it will work but really it doesn't once you try to search. I'm at a lose and need some advice other than chucking this laptop out the window.