USB-Ports deaktivieren&aktivieren in Delphi 7

[Der.Kaktus]

Hallo,
unter XP habe ich es soo gemacht..obs unter Windows 7 auch so geht..weiss ich nicht genau.

Delphi-Quellcode:

...

uses setupapi;

procedure Disable_USB;

var hdev: HDEVINFO;
    devinfo: TSPDevInfoData;
    DriverInfoData: TSPDrvInfoDataA;
    DriverInstallParams: TSPPropChangeParams;
    ClassInstallParams:TSPPropChangeParams;
    ClassInstallParamsSize: DWORD;
    devInfoListDetail: TSPDevInfoListDetailDataA;
    buffer:Array [0..1024] of char;
    buffersize,dataType:DWORD;
    status,problem:DWORD;
    i,z:integer;
    s:string;
    OK:Longbool;
begin
 devinfo.cbSize:= sizeof(devinfo);
 hdev:= SetupDiGetClassDevs(0,0,0,DIGCF_ALLCLASSES);
 if (hdev = NIL ) then
 begin
   Showmessage('Unable to enumerate device');
   exit;
 end;
 i:=0;
//Devices listen
 repeat
   Buffer[0]:=#0;
   if not (SetupDiEnumDeviceInfo(hdev,i,devinfo)) then break;
   if (GetLastError() = ERROR_NO_MORE_ITEMS) then break;
    if (SetupDiGetDeviceRegistryProperty(hdev,devinfo,SPDRP_DEVICEDESC,
                @DataType,@Buffer[0],sizeof(Buffer),@BufferSize)) then
     begin
      s:=strpas(Buffer);
   //suchen des speziellen Device
      if pos('USB Universal Host Controller',s)>0 then
      begin
        devInfoListDetail.cbSize:= sizeof(devInfoListDetail);
        ClassInstallParams.Classinstallheader.cbSize:= sizeof(_SP_CLASSINSTALL_HEADER);
        ClassInstallParams.Classinstallheader.Installfunction:=DIF_Propertychange;
// state disable setzen
        ClassInstallParams.statechange:=DICS_Disable;
        ClassInstallParams.Scope:=DICS_FLAG_CONFIGSPECIFIC;
        ClassInstallParams.HWProfile:=0;
        if SetupDiSetClassInstallParams(HDEV,@DevInfo,@ClassInstallParams.Classinstallheader,sizeof(ClassInstallParams)) then
        begin
         SetupDICallClassInstaller(DIF_PropertyChange,HDEV,@devinfo);
        end else z:=Getlasterror;
      end;
      Buffer[0]:=#0;
     end;
     i:=i+1;
 until false;
   SetupDiDestroyDeviceInfoList(hdev);
end;