Extending @ITWhisperer 's answer - unless you have a third-party solution (some form of asset inventory software or even your own scripted input listing installed software), Splunk on its own cannot tell you since it only works on the data you give it. So by default you can only pull what your Windows machine produces (event logs, maybe some log files). So if you can find this info in what Windows report on its own - good, you can use it. But I don't recall that it does.
