In the past few days,I am v confused to have IE not working in my computer,but other non-ie based browsers all working normally.I tried to find whether I have made some change to its internet connection setting but without luck.I downloaded and installed ie8,restarted the computer and then ie works again.^_^There has always been v unstable connection to the outside network.I tried to installed a chrome extension but it shows different errors till v late at night..I switched to linux and I find chrome web store worked.The hosts file may be corrupted in windows..I hope I can be more independent from windows..