I found this script, maybe someone can tell me what I need to edit to get it to work,
Option Explicit
Dim oFileSystem 'Scripting Dictionary object
Dim oWshShell 'Windows Script Host Shell object
Dim sCurrentName 'holds computername environment variable
Dim oWshEnvironment 'Windows Script Host environment object
Dim sTempDir 'temporary directory of computer on which comprename.vbs is run
Dim sPHASE 'holds number indicating PHASE in rename operation
Dim sProgram 'name of this script
Dim sProgramDir 'Path to this script
Set oFileSystem = CreateObject("Scripting.FileSystemObject"

Set oWshShell = CreateObject("WScript.Shell"

Set oWshEnvironment = oWshShell.Environment("Process"
sCurrentName = oWshEnvironment("COMPUTERNAME"

sTempDir = oWshEnvironment("TEMP"

sProgram = "computer_rename.vbs"
sProgramDir = oFileSystem.GetAbsolutePathName("."
On Error Resume Next
sPHASE = oWshShell.RegRead("HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Phase"
Select Case sPHASE
Case ""
Call REMOVE 'Subroutine
Case "1"
Call REJOIN 'Subroutine
End Select
'Restart computer
Dim OpSysSet, OpSys
Set OpSysSet = GetObject("winmgmts:{(Shutdown)}//./root/cimv2"

.ExecQuery("select * from Win32_OperatingSystem where Primary=true"

For Each OpSys In OpSysSet
OpSys.Reboot()
Next
WScript.Quit
'REMOVE Subroutine: Remove computer from domain, rename it and restart it
Sub REMOVE
'Create Dictionary (key: Name, item: NewName) and load data into it
Dim oCompName, oTextStream, sArray, sLine, sNewName
Dim oDictionary 'VBScript Dictionary Object
Set oDictionary = CreateObject("Scripting.Dictionary"

Set oCompName = oFileSystem.GetFile(sProgramDir & "\" & "compname.txt"

Set oTextStream = oCompName.OpenAsTextStream(1)
Do While Not oTextStream.AtEndOfStream
sLine = oTextStream.ReadLine
sArray = Split(sLine, " = ", -1, 1)
' sArray(0) contains NAME.
' sArray(1) contains NEWNAME.
oDictionary.Add sArray(0), sArray(1)
Loop
oTextStream.Close
'Abort if computer is NOT in list of those to be renamed
If oDictionary.Exists(sCurrentName) = FALSE Then
MsgBox("Error"

WScript.Quit
End If
'It's OK to proceed, so retrieve new computer name and place in variable sNewName
sNewName = oDictionary.Item(sCurrentName)
'Copy files necessary for the rename operation to local machine
oFileSystem.CopyFile sProgramDir & "\" & sProgram, sTempDir & "\" & sProgram
oFileSystem.CopyFile sProgramDir & "\" & "NETDOM.EXE", sTempDir & "\" & "NETDOM.EXE"
'Backup user logon name to PreviousName value
Dim sUserName
sUserName = oWshShell.RegRead("HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultUserName"

oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\PreviousUser", sUserName
'Increment PHASE value
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Phase", 1
'Place reference to program in RunOnce key
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\RUN_RENAME", sTempDir & "\" & sProgram
'Enable AutoAdminLogon
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoAdminLogon", 1
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultUserName", "XXX"
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultPassword", "XXX"
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultDomainName", sNewName
'Execute NETDOM REMOVE
oWshShell.Run sTempDir & "\" & "NETDOM.EXE REMOVE " & sCurrentName & " /D:XXX /Ud:XXX /Pd:XXX", 1, TRUE
'Rename computer
oWshShell.RegWrite "HKLM\SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName\ComputerName", sNewName
oWshShell.RegWrite "HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\NV Hostname", sNewName
End Sub
'REJOIN Subroutine: Rejoin computer to the domain and clean some stuff up
Sub REJOIN
'Restore previous user logon name from PreviousUser Value
Dim sUserName
sUserName = oWshShell.RegRead("HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\PreviousUser"

oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultUserName", sUserName
'Delete PHASE value
oWshShell.RegDelete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Phase"
'Disable AutoAdminLogon
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\AutoAdminLogon", 0
oWshShell.RegDelete "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultPassword"
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\DefaultDomainName", "XXX"
'Place clean-up routine in RunOnce key
Dim sCMD
sCMD = "c:\winnt\system32\"
oWshShell.RegWrite "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce\RUN_CLEANUP", sCMD & "CMD.EXE /c DEL " & sTempDir & "\" & sProgram
'Execute NETDOM JOIN
oWshShell.Run sTempDir & "\" & "NETDOM.EXE JOIN " & sCurrentName & " /D:XXX /Ud:XXX /Pd:XXX", 1, TRUE
End Sub