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If you are accessing Internet through proxy, it is difficult to update  Microsoft Security Essentials . Here is how to start: 1. Login with administrative privilege 2. run command prompt [ Start>Run>Cmd ] 3 reset your proxy environment by typing following commands    reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyEnable /t REG_DWORD /d 0 /f Hit enter reg delete "HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v ProxyServer /f   Hit enter 4.  In Vista and Windows 7       Type this syntax : NETSH WINHTTP SET PROXY (Number and proxy server)       Example: NETSH WINHTTP SET PROXY 1.1.1.1:8080       OR:         NETSH WINHTTP SET PROXY MYPROXY.NET:8080  In windows XP     type the syntax: PROXYCFG -P (Number and Proxy Server)    ...