Just had a friendly call from a lady in a call centre overseas.
She kindly offered to fix some problems on my computer. She said that she was calling from the support centre for my computer and if I switched it on she would guide me through the setting on WINDOWS!!!!!! and fix the known issues for me.
I asked how she know my computer ran on Windows. She said it was because they had all the details of the computers that their support centre supported.
When I told her my computers run on Linux she was not put off at first as she obviously did not know what Linux is.
She got the idea eventually and continued her search for a sucker elswhere.