KACE Product Support

Renaming the account is a likely less-than-optimal plan, but you can certainly add a new user with NET USER commands and then disable the local admin if you're really really sure...
Doc on net user:
http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/net_user.mspx?mfr=true

You can also do this via Group Policy.

The built-in admin account is also susceptible to brute-force attacks even if you rename it. So, if that is your reason for renaming it then there really is no point. The SID of the built-in admin account is always the same.

Thank you all for your insight. This has been extremely helpful. Also, thank you for the netuser link.

A little late to the party on this since I'm just starting to play with my K2000, but since I have the same problem in my XP environment I thought I'd figure this out....

If you already have this change in your environment (and are aware of the caveats mentioned here) - you can run this script as a post-install task to rename the local admin account. This example renames it to NotAdministrator.

John
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1) Save the script below to a vbs file (i.e. "renladmin.vbs").
2) Zip the vbs file (i.e. "renladmin.zip").
3) On the K2000, create a new Postinstallation Task - Add New Application...
4) Fill out the details

Name ----------------> Rename Local Admin Account (XP)
Runtime Env. ---------> Windows
File ------------------> * browse & upload your "renladmin.zip" file here
Command Line --------> cscript renladmin.vbs

5) Save and add to your scripted install as a postinstall task.

Note - I tried an Add New BAT Script post-install task and pasted the vbs code there, but it didn't do anything. Possible I did something wrong there, but this approach does work (I just tested it).
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strComputer = "."

Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set colAccounts = objWMIService.ExecQuery _
("Select * From Win32_UserAccount Where LocalAccount = True And Name = 'Administrator'")

For Each objAccount in colAccounts
objAccount.Rename "NotAdministrator"
Next
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* "borrowed" from the Hey, Scripting Guy! Blog
http://blogs.technet.com/b/heyscriptingguy/archive/2006/05/17/how-can-i-rename-a-local-user-account-on-a-windows-xp-computer.aspx