Hi, here's the log from the trace file:

Errors in file d:\oracle\admin\libdb\udump\libdb_ora_3504.trc:
ORA-00600: internal error code, arguments: [qctstc2o1], [3], [1], [31], [1], [4000], [0], []

Wed Oct 19 09:26:49 2005
Errors in file d:\oracle\admin\libdb\bdump\libdb_smon_3012.trc:
ORA-00600: internal error code, arguments: [qctstc2o1], [3], [1], [31], [1], [4000], [0], []

Wed Oct 19 09:26:49 2005
Errors in file d:\oracle\admin\libdb\udump\libdb_ora_3504.trc:
ORA-00000: normal, successful completion

Wed Oct 19 09:26:49 2005
Error 0 happened during db open, shutting down database
Instance terminated by USER, pid = 3504
ORA-1092 signalled during: ALTER DATABASE OPEN...