I haven't installed the personal edition of the database, but I can't imagine it is much different than the other editions. Are you sure that you created a database during the installation? Since 9i, the database creation assistant has prompted for the SYS and system passwords, and you are required to enter them before it will finish the assistant. You should see an OracleServiceSID entry in the services control panel. If you do not, then you haven't created a database. To create a database, go to Start->Programs->Oracle - ORACLE_HOME_NAME->Configuration and Migration Tools->Database Creation Assistant.
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