Thank you for reply me. Actually, I am using both personal oracle 8i on Win98 and Oracle 8i enterprise version on Win NT(this one also giving me problem when i trying to log in OEM).
So, please reply me if you have used the personal oracle 8i on win98 or oracle 8i enterprise on Win NT.

Thank you again. :)

Best regards jung

P.S I am log in pl/sql as name:system , password:manager.
, and if i open demobld in Bin dir, it works but not 100%