all versions of Oracle server before 8.1.6 are pretty unstable under Windows NT 4.0 with Service Pack 6.0 and frequent internal errors cause the server to discontinue its operation
Looking in the alert log or looking through any trace files in your background_dump_dest may help diagnose the problem
check out the link and try
http://home.clara.net/dwotton/dba/ora3113.htm
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