Random SID & Computer Name Scripting Help

Is it possible to create a script that, on startup, will request user imput to rename the computer from a set list of names and then create a random SID, then deletes itself so users on the pc will not accidently stumble across it.

I would use Sysprep however have not been trained and my attempt at teaching myself ended up a disaster. I have also looked into NewSid however cannot get it to change the computer name and sid after the reboot not before.

Any Help Will be greatly appriciated.

Thanks Everyone