What are you on about? Reread my original post, last sentence in particular.
I was talking about "if" the OPs relative wasn't very computer literate, and the scammer on about problems with his windows system, which would be impossible if he was on a different OS.
Leave the Windows vs Linux debate for another thread.
Linux offers obscurity, nothing else, whilst introducing similar threats and a foreign environment.
The "just use Linux" recommendation never seems to be well thought out.