Start maven with -X option (debug) and examine the beginning of the output. There should be something like this:
...
[INFO] Error stacktraces are turned on.
[DEBUG] Reading global settings from c:....apache-maven-3.0.3confsettings.xml
[DEBUG] Reading user settings from c:.....m2settings.xml
[DEBUG] Using local repository at C:....
epository
...
(Original directory names are removed by me)
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