This tool might be useful, it is called X-Ray My PC scanner:
http://www.xraymypc.com/scanner.html
It finds all processes on your machine and gives descriptions and security risks for each of them. Task Manager does not show all the processes, plus virus files are designed not to show in the Task Manager; but X-ray will show them. If there is no description for a specific process, most likely it is a malicious process as well.
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