Hello RB thanks for your help,
the parameter for the \HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE was se to SPANISH_VENEZUELA.WE8MSWIN1252 and the parameters NLS for the user was AMERICAN_AMERICA.UTF8.
so i change the \HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE to AMERICAN_AMERICA.UTF8 and set the user and system variables to AMERICAN_AMERICA.UTF8.
i stop the upgade restart the server and continue the uprade but i still have the error. 
we are using oracle 11g
any idea?
Regards,