Hello,
Here is a Very important Document for the same.
Symantec Endpoint Protection 11.0 compatibility with 64-bit platform
http://www.symantec.com/docs/TECH102143
Currently the following SEP 11.x features do not run on 64 bit Windows systems:
- Device Control
- Tamper Protection (AKA SymProtect)
- Right Click “Scan for Viruses…”
- Lotus Notes (Domino), Microsoft Exchange and POP3/SMTP email scanning
- System Lockdown
- Central Quarantine
- Proactive Threat Protection will not detect poller type keyloggers (although this shouldn’t be cause for concern as Auto-Protect is far more accurate at detecting keyloggers)
I would suggest you to Migrate to SEP 12.1.
http://www.symantec.com/docs/TECH162730
Features supported on 64 bit OS
-AV
-Proactive threat Scan (a.k.a truscan or Sonar)
-Bloodhound
-Malheur
-Tamper Protection
-Internet email scanning
-Device Control
-Application Control
-System Lockdown
-Outlook Email Scanning
-Lotus Notes Email Scanning
-Right Click scan for viruses
-Firewall
-IPS
-Application learning
-Host Integrity (SNAC)
Also, check the Comparision between SEP 11.x and SEP 12.1 (file attached)
Hope that helps!!