System is not found in the Deployment Wizard?
You need to make sure firewall is off on Windows 8 as well as UAC.
check this
Preparing Windows and Mac computers for remote deployment
http://www.symantec.com/business/support/index?page=content&id=HOWTO80805
Just export the package from SEPM and isntall it manually on windows 8, would be easlier if you are having less windows 8.
This is how you export package from SEPM
How to export Symantec Endpoint Protection (SEP) client install packages without any definitions or package with Basic Content.
http://www.symantec.com/business/support/index?page=content&id=TECH178698