Neither FF, Opera or Chrome open on my Sony Vaio 64bit system. I know I have Internet access as Avast updates every day. When the relevant icons are pressed the Blue loading ring appears for a few seconds then disappears. When I try to access Task manager by ctr/alt/del the screen appears asking which service I require but when I select Task manager the Blue ring appears and again disappears and nothing happens. I regularly run anti virus scans and everything else seems to work okay. I've heard a rumour that the Bonjour service could be the problem. I I did uninstall it but maybe there is something left behind. but without access to Task manager I can't see what's running.