9i R2 not automatically starting up after upgrade

I upgraded a database yesterday from 9i R1 (9.0.1) to 9i R2 (9.2.0.1.0), and am now having problems with the database starting up automatically on system reboot. This is on a Windows 2000 Pro machine. The error that I get when I try to connect with SQL*Plus is "ORA-27101: shared memory realm does not exist". If I run SQL*Plus with the /nolog option, connect / as sysdba, and startup manually, everything works fine. Anyone have any idea why it won't startup automatically, or what I could try to get it to? Thanks.

_YEX_ /*
|| Robert D. Yexley
|| Oracle Programmer/Analyst
|| Easylink Services Corporation
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|| <)))><

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