This chart that lists the latest versions of the various database products available. This unofficial build chart lists all of the known KB articles, hotfixes and other builds of MS SQL Server 2014, 2012, 2008 R2, 2008, 2005, 2000 and 7.0 that have been released.
It is important that you have the latest service packs and updates installed for the version of Windows the server is running, but also for the SQL Server instance as well.
You can get the current version of your SQL Server instance with this query, which should return your version information:
Select @@version Microsoft SQL Server 2008 (SP1) - 10.0.2531.0 (X64) Mar 29 2009 10:11:52 Copyright (c) 1988-2008 Microsoft Corporation Express Edition (64-bit) on Windows NT 6.1 <X64> (Build 7600: )