Problem system>admin>users and groups

[ashwin1711]

Dear sir,
I have got problem with my Ubuntu.I
was running quiet well but I went in System>admin>users and group
problem and I make some changes there.

'1)I add New users there to click on add user
2)I I wrote real name and username and passwords
3)Moved as a Administrator
3) went in the groups and delete home from there
and click on ok after that I open terminal it says in place of my real
username ashwn deleted and it wrote there I have no name at ashwn-laptop
and after signout I could not open with my username and password.Now I
am accessing only with the name of user which I add in last but I
could not make change in users and group now because it and there is
no

it says you are not allowed to system administration

please help me


-- 
ASHWIN JANGAM