Check SNAC SEP 12.1.4 support list
Table 1-7 Symantec Network Access Control On-Demand client system
requirements (continued)
Component Requirement
■ Windows XP Home or Professional (32-bit; SP2 and SP3)
■ Windows Vista (32-bit, 64-bit)
■ Windows 7 (32-bit, 64-bit)
■ Windows 8 (32-bit, 64-bit)
■ Windows 8.1 (32-bit, 64-bit)
■ Windows Server 2003 (32-bit, 64-bit; R2, SP1 or later)
■ Windows Server 2008 (32-bit, 64-bit; R2)
■ Windows Server 2012
■ Windows Server 2012 R2
■ Windows Small Business Server 2008 (64-bit)
■ Windows Essential Business Server 2008 (64-bit)
■ Mac OS X 10.5, 10.6 or 10.7
http://www.symantec.com/business/support/index?page=content&id=DOC6838