That's quite an old one and I haven't seen it around for a long time. I'll put one website down that has a set-up to download a tool to remove it but I would just use the manual way. But, if I were you, I would download Malwarebytes free and that will catch it and help remove it. But you can look at this other site also. Your choice but Malwarebytes is a proven method.
How To Remove Virus:Win64/Viknok.A From PC ...
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