hello folks, have been getting the following error messages all over the weekend, called out twice becuase database crashed, although the errors keep spewing out every five minutes (on ALRT file)

ORACLE Instance pmlv (pid = 6) - Error 600 encountered while recovering transaction (5, 12) on object 1480.
Mon May 21 08:01:47 2001
Errors in file C:\ORANT\RDBMS73\trace\pmlvSMON.TRC:
ORA-00600: internal error code, arguments: [6006], [1], [], [], [], [], [], []

Mon May 21 08:06:48 2001
Errors in file C:\ORANT\RDBMS73\trace\pmlvSMON.TRC:
ORA-00600: internal error code, arguments: [6006], [1], [], [], [], [], [], []

Any assistance gratefully received.