I am running Oracle 8.1.7

I created one database one month back, its running successfully until today.

3 days back my collegue created another database for different apllication.

Till today morning there is no problem with the two databases. But today morning there is a problem with First Database. Second database is working fine. But When I am trying to start First Datase its checking for the Second Database's Password file and its giving error message this is not a valid password file. Even my first database's password file is existing in the same folder but it not checking the password file of First Database.

How do I up the First Database?