Hi. Friends,
Just copy SAP_USER profile from the Master client 000 or some other master type client which have administrator right. But be careful before copy since you should Know the user name or password of that master client. Since while coping all the data of SAP_USR profile of your client will be overwrite. Now you should be able to login by Master Client user name and password.
Now the No. company default maintain will be resolved.
Manoj Mandal