Tor has been working fine for ages, but after prompting to upgrade itself can no longer start, constantly saying that it had 'unexpectedly exited'. I looked here and the advice was to delete the folder but that's proved impossible, with many files locked, and trying to copy the log file produced a blank document.
Again, I looked here and the other advice was to reinstall, so I tried that but once again got errors
error opening file for writing:
So I'm totally stuck. I've got bits of the first installation that can't be deleted and half a reinstall. Help!