I am trying to create a query that shows how many computers have the Windows Agent installed against how many of those have the VSE client installed. Considering not all computers have the agent installed yet.... Any ideas?
If they don't have an Agent it might be difficult as it won't report back to EPO.
I would write a script looking for the MA agent, export all the managed computers from EPO and compare what's missing.
If your goal is to install the agent on the missing computers personally I would just export all computers from active directory (if you have them all in there) and install via EPO. System Tree - New Systems. Fill in the details as required.