The output of @@Versions confuses so many people. The different colours show what's referring to what.
Microsoft SQL Server 2000 - 8.00.2055 (Intel X86)
Dec 16 2008 19:46:53
Copyright (c) 1988-2003 Microsoft Corporation
Enterprise Edition on Windows NT 5.2 (Build 3790: Service Pack 2)
Version 2055 appears to be SP4 with some additional hotfixes applied.
http://www.sqlsecurity.com/FAQs/SQLServerVersionDatabase/tabid/63/Default.aspx is pretty good and lists SP4 as 2039, you you're a little above that.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability