I presume this script can check if the Quick Launch Toolbar is disabled on Windows XP:
;************************************************************************* 
; Script Name: EnableQLToolbar
; Author: Wim Rotty
; Date: 2008/9/11
; Description: Enable Quick Launch Toolbar only if it is disabled
;*************************************************************************

;;;;;;;;;;;;;;;;;;
; Script Options ;
;;;;;;;;;;;;;;;;;;

If Not @LOGONMODE
Break On
Else
Break Off
EndIf
Dim $RC
$RC = SetOption("Explicit", "On")
$RC = SetOption("NoMacrosInStrings", "On")
$RC = SetOption("NoVarsInStrings", "On")
If @SCRIPTEXE = "KIX32.EXE"
$RC = SetOption("WrapAtEOL", "On")
EndIf

;;;;;;;;;;;;;;;;;;;;;
; Declare variables ;
;;;;;;;;;;;;;;;;;;;;;

DIM $TaskbarWinXP

;;;;;;;;
; Code ;
;;;;;;;;

; -- QL: Enable Quick Launch Toolbar
; Check if OS is Windows XP
If @DOS = "5.1"
; $TaskbarWinXP = ReadValue('HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Streams\Desktop','TaskbarWinXP')
$TaskbarWinXP = ReadValue('HKEY_USERS\'+@SID+'\Software\Microsoft\Windows\CurrentVersion\Explorer\Streams\Desktop','TaskbarWinXP')
; Check if Quick Launch Toolbar is disabled
If
; Check if RegName TaskbarWinXP exists
@ERROR<>0
Or
; Check if the Value for TaskbarWinXP is 248 chars long
Len($TaskbarWinXP)=248 And
; Check the left 64 chars of the Value for TaskbarWinXP
Left($TaskbarWinXP,64)='0c000000080000000200000000000000aa4f2868486ad0118c7800c04fd918b4' And
; Check the right 180 chars of the Value for TaskbarWinXP
Right($TaskbarWinXP,180)='0000600d0000000000001e00000000000000000000001e0000000000000001000000010000008'+
'b8a0d543f1c324e8132530f6a5020901d00000060050000000000001c00000000000000000000001c0000000000000001000000'
; ? "Disabled"
Shell '"%ComSpec%" /C "'+@LSERVER+'\NETLOGON\toggleql.exe" 1'
; Else
; ? "Enabled"
EndIf
EndIf