Palani,
We need a little more info.
What exactly do you mean you are unable to log onto SME using palani ?
Did you :-
a) Set SME as a Domain controller and remembered to :-
i) Apply the signorseal registry change to Windows XP
ii) Joined the XP box to the SMEBOX domain
iii) use the same username and password on both SME and on the XP box
iv) You are running XP Pro and NOT XP Home
or
b) Set SME as a Workgroup server and :-
i) apply the signorseal registry change to XP
ii) Log in to XP locally using the same username and password as you created on SME
If (b), you don't really "log in" to the server per se, you can browse / map drives / etc as long as your XP username and password combination matches the account created on SME.
More info would b helpful.
Kelvin