hadoop 0.20.2 on windows

Hi, I need to make a fully distributed hadoop (version 0.20.2) with 1 master and 1 slave on windows. I have followed these steps but something goes wrong

(Italic words are executed on each pc of the lan)

on each pc of the lan modify c:\windows\system32\drivers\etc\hosts with the ip of the master and slaves
master NNN.NNN.NNN.NNN
slave NNN.NNN.NNN.NNN

Unlock port 22 on the firewall

Install cygwin with ssh

On cygwin
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
on the master: scp ~/.ssh/id_dsa.pub <slaveusername>@slave:~/.ssh/master-key.pub
on the slave: cat ~/.ssh/master-key.pub >> ~/.ssh/authorized_keys
on the slave: scp ~/.ssh/id_dsa.pub <masterusername>@master:~/.ssh/slave-key.pub
on the master: cat ~/.ssh/slave-key.pub >> ~/.ssh/authorized_keys

extract hadoop in c:\cygwin\usr\local

in hadoop/conf modify:

hadoop-env
export JAVA_HOME=c:\\Program\ Files\\Java\\jdk1.7
export HADOOP_IDENT_STRING=MYHADOOP

core-site
<property>
<name>fs.default.name</name>
<value>hdfs://master:54310</value>
</property>

mapread-site
<property>
<name>mapred.job.tracker</name>
<value>master:54311</value>
</property>

hdfs-site
<property>
<name>dfs.replication</name>
<value>2</value>
</property>

slaves
master
slave

on the master start cygwin
cd /usr/local/hadoop
bin/start-dfs.sh
bin/start-mapred.sh

on the browser (of the master)
http://localhost:50070/

on the browser i can only see one live node, the master. Why? Thanks in advance