C++ Application "not responding" with System (); API

[Michelins]

I'm working with the environment, have the following code, is a part of a GUI APP

void APPDlg::WxButton1Click(wxCommandEvent& event)
{
         system("start /mim /w cleaner.exe");/ / Call the application cleaner.exe to run minimized and wait for the completion contiunuar with code
         WxGauge1->SetValue(50);
         system("start /mim /w finishing.exe");
         WxGauge1->SetValue(100);
         MessageBox(NULL,"Complete Clean, press ok to exit","Info",MB_OK | MB_ICONINFORMATION | MB_TOPMOST);
         exit(1);
}

Well, each. exe called by system, it takes about 3 minutes to complete, meanwhile, the application is hung (not responding), and even sets the WxGauge1 to 50, only when the two. exe's close, it sets the value correctly. ..

What to do for the application does not crash?

Thanks.

[Michelins]

Please :(