HowhowWSE 64-bit

The upgrade notes for WSE 4.7.4 state that this will be the last version to support 32-bit installations. I have 64-bit processors, 64-bit Windows Server, and WSE is using the 64-bit version of Java, but WSE itself is installed under the Program Files (x86) folder. How do I confirm which version of WSE that I am using?