Support for Windows 8 and Windows Server 2012 is introduced with the release of SEP 12.1 Release Update 2 (RU2). SEP 12.1 RU2 is the earliest supported build that is compatable with Windows 8 and Server 2012
http://www.symantec.com/docs/TECH174348
Please note there is currently no SEP 11.x version that would be compatible with either Windows 8 or Windows Server 2012 - you will need to stick with SEP 12.1 RU2.
For Server 2008 it is fine to use the SEP 11.x - please refere to the documentation provided above for preparing the image for SEP deployment.