Hi JimPo,
If you upgrade to OS X 10.9 from a previous version of OS X and you leave an older SEP Mac client (12.1.2015) intact, it will appear to be functioning normally but it's a false assumption. Symantec's guidance on this is to fully remove the SEP client before updating the OS; this applies to either PCs or Macs.
http://www.symantec.com/docs/TECH134203
You need to use the SEP Mac removal tool, reboot and install either managed or self-managed SEP Mac 12.1 RU4 (12.1.4013 or 12.1.4100). Then I would perform a full scan with latest definitions and report back your findings.
You can download the SEP Mac removal tool from:
ftp://ftp.symantec.com/misc/tools/mactools/RemoveSymantecMacFiles.zip
You asked how to get the updated version. How did you get the version you are running? Was it provided by your employer? If so, touch base with your IT department and tell them you need SEP for Mac RU4. LiveUpdate does not update the actual version of the software, only the definitions.
Cheers!
MJD