As already mentioned by other monks, it should be in your @INC. You can check if the required dirs are in it.

use Data::Dumper;
print STDERR Dumper( \@INC );
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If it's not there, the module won't be found. You can add it to the @INC with:

sub BEGIN {
    unshift @INC, 'c:/Perl64/site/lib';
    unshift @INC, 'c:/.....';    # what ever you needed
}
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BTW, it should be '/' and not '\' in your script.