Microsoft SQL Server 2008 Service Pack 2(10.00.1600.22) right now we are using in sreego

You can write in Query window to find which version of SQL Server 2008 is running ?

SELECT SERVERPROPERTY('productversion'), SERVERPROPERTY ('productlevel'), SERVERPROPERTY ('edition')
(or)
SELECT  @@Version
Microsoft SQL Server 2008 Service Pack 2 (SP2) is now available for download.

http://www.microsoft.com/download/en/details.aspx?id=12548