You still didn't say why you don't use a GPO. I mean, they are sooo easy!

You should be able to do it as reg hacks in the users logon script. {yuck}

Still, if you want to do it the hard way {YUCK}, you can start by looking up LoadHive() in the manual.
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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.