I too struggeled, using Win7 x64 and the latest ActiveState Perl, when I tried to install custom PPMs.
By pure coincidence, noticed some place a link to ActiveState's PPM repository (or links from here to CPAN).
Also on this page, quite simple explanation on how to install - what a relief because I never got the "cpan App::cpanminus" to work either.
Long Story Short; it seems that your BerkelyeDB module is not available for Win (among many OSs) http://code.activestate.com/ppm/BerkeleyDB/
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