If its stand alone then Norton 2010 , If Standalone but Office server then SEP 12.x
If a network of less than 50 computers then also SEP 12.x
if more thn 50 then go for SEP 11.x
You need to install SEP client on Server 2008
Make sure you download and use the latest version from
https://fileconnect.symantec.com
Install version 12.0.1001.95