Error: Service terminated unexpectedly

Hi Friends,

Please, need help : A database in my company stops suddenly and the following message appear in Windows Event Viewer:
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The OracleService service terminated unexpectedly.   It has done this 2 time(s).
  The following corrective action will be taken in 0 milliseconds:  No action.
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Thanks for any help. Received on Fri Mar 02 2007 - 06:54:53 CST