とりあえず、
install XML::Atom::Feed
とすると、したみたいになった。これってATOM::XML　ってインストールできたのかな
Prepending C:\strawberry\cpan\build\XML-Atom-0.37-H4btN8/blib/arch C:\strawberry
\cpan\build\XML-Atom-0.37-H4btN8/blib/lib to PERL5LIB for 'install'
Installing C:\strawberry\perl\site\lib\XML\Atom.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Base.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Category.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Client.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Content.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Entry.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\ErrorHandler.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Feed.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Link.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Person.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Server.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Thing.pm
Installing C:\strawberry\perl\site\lib\XML\Atom\Util.pm
Appending installation info to C:\strawberry\perl\lib/perllocal.pod
MIYAGAWA/XML-Atom-0.37.tar.gz
C:\strawberry\c\bin\dmake.EXE install UNINST=1 -- OK
cpan>