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Is the file %SysDir%\drivers\sst2.sys located on your computer? Your computer is infected.
We highly recommend you to remove %SysDir%\drivers\sst2.sys from your computer as soon as possible.
%SysDir%\drivers\sst2.sys is Trojan/Backdoor.
Kill the process %SysDir%\drivers\sst2.sys and remove %SysDir%\drivers\sst2.sys from Windows startup.