If you're running Windows 8, do:
1) Start -> PowerShell
2) run PowerShell as Administrator
3) run the command confirm-SecureBootUEFI
if it returns TRUE, you have Secure Boot. Otherwise you don't.
If you don't have Windows 8, you can check whether Secure Boot is supported by running the Upgrade Assistant:
Upgrade to Windows 8 - Microsoft Windows...
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