Since the last week or so my Samsung NP-R420 laptop is behaving in a suspicious manner. Sometimes I get offers to buy new anti-virus or free updates for Windows. Even there were two three folders that were present before I scanned my system but they disappear while scanning and re-appear back. My AVG detects some thing as Backdoor.Win32.Agent.abgg virus and deletes it also. But every time again it keeps coming back. How to kill this virus?
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