Rotina para obter Temperatura da cpu dá erro

interface

uses
  Windows, SysUtils, Forms, Dialogs, Classes, ActiveX, ComObj;

function   GetObject(Value: String): IUnknown;
procedure  DisplayTemperatures;

implementation

procedure DisplayTemperatures;
var  ovObjSet:   OleVariant;
     ovObj:      OleVariant;
     ovEnum:     OleVariant;
     // Hack cast - as WMI really exposes the collection as IEnumWbemClassObject,
     // which is identical to IEnumXXXX collections
     pvEnum:     IEnumVariant;
     dwFetch:    Cardinal;
begin

  ovObjSet:=GetObject(´winmgmts:{impersonationLevel=impersonate}´) as IDispatch;
  ovObjSet:=ovObjSet.InstancesOf(´Win32_TemperatureProbe´);
  ovEnum:=ovObjSet._NewEnum;
  pvEnum:=IEnumVariant(TVarData(ovEnum).VUnknown);
  pvEnum.Reset;
  while (pvEnum.Next(1, ovObj, dwFetch) = S_OK) do
  begin
     //  CurrentReading
     //    Data type: sint32
     //    Access type: Read-only
     //    Qualifiers: Units(Tenths of degrees Centigrade)
     //    Current value indicated by the sensor. This property is inherited from CIM_NumericSensor.
     ShowMessage(ovObj.CurrentReading);
     ovObj:=Unassigned;
  end;
  pvEnum:=nil;
  ovEnum:=Unassigned;
  ovObjSet:=Unassigned;

end;

function GetObject(Value: String): IUnknown;
var  pUnk:       IUnknown;
     pmk:        IMoniker;
     pbc:        IBindCtx;
     cbEaten:    LongInt;
     clsid:      TGUID;
begin

  // Check value to determine if this is a programmatic id or a moniker
  if (CLSIDFromProgID(PWideChar(WideString(Value)), clsid) = S_OK) then
  begin
     // Attempt to get the active object, clear the result on failure
     if not(GetActiveObject(clsid, nil, result) = S_OK) then result:=nil;
  end
  else
  begin
     // Moniker name
     if (CreateBindCtx(0, pbc) = S_OK) then
     begin
        if (MkParseDisplayName(pbc, StringToOleStr(Value), cbEaten, pmk) = S_OK) then
        begin
           // Attempt to bind the moniker, clear the result on failure
           if not(BindMoniker(pmk, 0, IUnknown, result) = S_OK) then result:=nil;
           // Release the moniker
           pmk:=nil;
        end;
        // Release the bind context
        pbc:=nil;
     end;
  end;

end;
end.