Since you did't post your script, it is impossible to tell if something in the script is causing it. Try running a test with just a 'Hello World' script. It seems very strange that a script run on the client could cause a DC to reboot.
You still have not told us what version of KiX you are running. I assume if the clients are all W2K that you have not installed the KXRPC service. Is this the case?
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.
