SqlDupmExceptionalHandler Server Error

I’ve a table with 200,000 records which is with 30 columns. If I fire a select query to fetch 20 columns, MS-SQL Server ver 7.0 gives the follwing error;

ODBC: Msg 0, Level 19, State 1
SqlDumpExceptionHandler: Process 12 generated fatal exception c0000093 EXCEPTION_FLT_UNDERFLOW.
SQL Server is terminating this process.

Connection Broken.

My client Machine is Win 98 and MS-SQL Server ver 7.0 running on Win Nt ver 4.0.

On one day that table completly corrupted and I’ld not access it. When I tried to access the table I got read failure.

This table has composite primary key.
Any other information if you want I’d give you. Can any tell me what could be the problem.