thank you for the reply
I assume i should do this through SQL plus?
anyway, now am getting new error: ORA-00020: maximum number of processes (150) exceeded
I get this error when trying to login to SQL plus, or create/configure database.
I tried deleting oracle 11g via universal installer i get message saying run the command c:\...dbhome_1\deinstall\deinstall
I don't understand Oracle totally collapsed in my laptop with no reason