PUT
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o ORA_SID_SHUTDOWN=true (this means it will go down when the system is going down normally.)
o ORA_SID_SHUTDOWN_TIMEOUT=30 (in secs. This is the time for which the system will wait for the OracleService to go down. After that its Shutdown abort.)
o ORA_SID_SHUTDOWNTYPE=i (for immediate) a(for abort)
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in regedit HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\HOME0
These are the default values. You can change them according to your needs...
where SID=SID of your database.