Microsoft has released a Post Service Pack 5a Update for SQL Server 6.5.
If you are running SQL Server 6.5 Service Pack 5 or 5a, Microsoft recommends that you apply this update to your system only if your configuration is affected by problems that are fixed by this update.Download
To see a complete list of fixes that are included in this update, see the following article in the Microsoft Knowledge Base:
Q274035 INF: SQL Server 6.5 Post Service Pack 5a Update Fixlist
This update should only be applied to installations of SQL Server that are running SQL Server 6.5 Service Pack 5 or 5a. To determine which SQL Server service pack is currently running on your computer, execute the following statement from either ISQL or ISQL/w:
SELECT @@version