[Iska]

Например, так:

Код:

AutoItSetOption("MustDeclareVars", 1)

Local $sUserName = "SomeUser"
Local $sNewUserName

$sNewUserName = InputBox("Title", "Prompt", $sUserName, "", Default, Default, Default, Default, 60)

Switch @error
	Case 0 ; Success input
		RunWait("renuser.exe Администратор " & $sNewUserName)
	Case 1 ; Cancel input
		ConsoleWrite("User cancelled input" & @CRLF)
	Case 2 ; Input timeout
		RunWait("renuser.exe Администратор " & $sUserName)
	Case Else ; Other errors
		ConsoleWrite("Other errors" & @CRLF)
EndSwitch

Exit(0)