ordim80..INTPWD

Hi everybody.
I"m a beginner with oracle . we start stadying oracle administration on oracle8.
well the problem I have is that i could not change the pass word (for internal) for the default instance ORCL using oradim80.
when I execute C:\ORADIM80 -INTPWD new_pwd //by default ORCL
all wht i can i see is the help to use ORADIM80.. I tried to use the graphic interface but it doenst appear!!
even when I lookfor the file ORADIM80.log on the RDBM80 to verify the operations I dont find it ...
so I don t know really much about that .. so if sombody could help..
thanks