I got a very rare and hard issue. I have three browsers installed on my computer, chrome, IE and firefox. Several days ago, after I maintained my application list, I uninstalled some vpn software or other. All my three browsers don't work. Then I uninstall chrome and IE 11, reinstalled them. after reinstall, chrome can work well, but IE and firefox doesn't work. IE gave error 'cannot open serach page' Firefox gave error "cannot open the page".
another thing I noticed is my malwarebyte cannot update since then.