There is a registry setting that will tell you whether Physical Address Extension (PAE) is enabled.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Memory Management\PhysicalAddressExtension
If it is set to 1, then the kernel with PAE support was loaded at startup
WMI will give you this via the command line util 'WMIC', for example:
C:\> wmic os get PAEEnabled
PAEEnabled
TRUE
C:\>
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