How to "dummy-down" a client computer?

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http://serverfault.com – I would like to create multiple small computers with Windows 7 Pro, and would like to know how I can turn this client into a "dummy" computer. In other words, I'd like to disable anything in Windows which is not related to its sole purpose. Each machine will run a single business application only, and do nothing else. I have experimented with disabling unnecessary services and applications, and am currently online posting this question successfully with my limited Windows Services. These are the services which are currently running: And these are the processes (in exception of Chrome): M (HowTos)