Windows 10 Product Key Activation Issue

[Heydon2015]

This morning I had a telephone call from a lady claiming she was phoning from capital one in London , she did give address , but spoke quickly I couldn't get it down , claiming that my PC had downloaded some ing called event viewer , and that it was broadcasting on the internet etc , I challenged her and the moment I challenged her she put the phone down .....I suspected a scam from the word go she didn't know which version of Windows I was running she said Windows 7 , if she'd really been from "Windows " as she put it then she would know , I therefore want to put it out there about these scam phone calls in case they do catch someone out