In answer - F: is an internal HD. No NAS, no portable install. No VM. Is a 64bit system.
_bz2.pyd is in \bin
Since C: is a SSD with limited space, I try to avoid installing on it, so I use F: instead
Norton firewall - if I turn it off it makes no difference.
BEFORE I do anything stupid - if I uninstall Calibre ( to re-install) will all data//files/books remain??
My guess is I should either install the 32 bit version in Program Files (x86), or the 64bit version into Program Files. I think my 64 bit install overwrote the old Calibre version, but I think that was also a 64bit version, but it's been a while, so maybe not.
Thanks to everyone for their help.
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