Speaking from experience, renaming those executables is generallly a bad idea unless they are a single-executable program. Proggies like Norton and ZA or Black Ice will launch new processes that will still be named the same, and virii can still kill them.
Personally, I'm a fan of DeepFreeze. My users all have a shared server folder that all of their data is sotred in, and every workstation reverts to a prostine state when rebooted. Now instead of recovering a machine, I just have a user save their work and reboot.
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