user is locked. how to unlock the user in SAP?

Hi all,

i have installed SAP 4.6c in my desktop. i have only 1 userid & 1 password.i have forgotten my password.

so i tried so many times then finally user is locked. so how to unlock this user or how to login to sap?

i do not have any other user id .This user id is locked for all the clients. plz give some suggestion.it's important.

Regards