What is hardened mode in avast

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I ran full scan of avast antivirus and also grimefighter too but no luck.I am exhausted with a program known as 'Plugin.exe' i don't know how it came but whenever i start my program it opens up and i have noticed that it only opens in when my internet connection is on. I am using a netbook of samsung with windows 7 starter service pack 1 32 bit.