Accessing Enterprise manager - oracle 11g - windows 2003 - password failure

[Palanikumar]

We have windows 2003 server and we are running 2 oracle databases in
version 11g.
We were successfully configured EM for one database and when we were
tried for the other database we encountered configuration errors and
we were able to sort by searching on "google", solution was "ocijdbc10
file has to be placed in the bin directoy". It worked but we landed up
in accessing the EM. It is not accepting sys/pwd as sysdba which i can
use for the sqlplus session.

Can anybody suggest what would be the cause and solution or work
around for this.

Thank you

PKS