Hey Buddy,
Sounds like you're going to install standalone drive encryption. Don't be alarmed but Endpoint Encryption is the wrong product. The correct product is available to you through the same purchase, so it's no big deal. You'll want to download "Symatnec Encryption Destkop" which may be listed as "Standalone Drive Encryption" at your download location.
I am including a step by step guide to install Symantec Encryption Desktop for Standalone drive encryption.
How To Install Symantec Encryption Desktop for Windows (Unmanaged/Standalone) - http://www.symantec.com/docs/HOWTO101895
HOWTO: Encrypt a Windows Drive with Symantec Encryption Desktop - http://www.symantec.com/docs/HOWTO109656
When you go to activate your software, the DU license key will activate it. It's normally in your order confirmation email just below the D4 license key.
Best Regards,
Phil
Sr. Technical Support Engineer | Information Protection
Symantec Corporation | www.symantec.com
Comptia | Security+ Certified