Thanks - the command to re-create the books folder seems to have done the trick (the first one failed saying the folder already existed).
Just for interest, every time I ran the prs500 command I got a message stating
C:\Program Files\calibre\library.zip\calibre\devices\prs500\p rstypes.py:173: DeprecationWarning: struct integer overflow masking is deprecated
though the command seemed to execute OK
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