Oracle Database Discussions

Hi,

My oracle database shutdown unexpectedly several times this week and the alert log shows the below errors

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database shutdown unexpectedly with the folloing messge in alert
Fatal NI connect error 12560, connecting to:
(LOCAL=NO)

VERSION INFORMATION:
TNS for 64-bit Windows: Version 11.1.0.6.0 - Production
Oracle Bequeath NT Protocol Adapter for 64-bit Windows: Version 11.1.0.6.0 - Production
Windows NT TCP/IP NT Protocol Adapter for 64-bit Windows: Version 11.1.0.6.0 - Production
Time: 29-JUL-2012 06:24:48
Tracing not turned on.
Tns error struct:
ns main err code: 12560

TNS-12560: TNS:protocol adapter error
ns secondary err code: 0
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
ORA-609 : opiodr aborting process unknown ospid (3948_1704)
Sun Jul 29 06:26:54 2012
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Please any help ???

Thanks