oCollection = CreateObject( "Shell.Application" ) ?oCollection.Windows.Count && let us say, 3 oIE = CreateObject("InternetExplorer.Application") oIE.visible=.t. ?oCollection.Windows.Count && 4 * at this point it happens with less frequency ?oCollection.Windows.Count && ERROR, "class is not registered" ?? oIE.Navigate(.....) && fine, it is here, no matter error occured or not * at this point it happens with more frequency ?oCollection.Windows.Count && ERROR, "class is not registered" ??And I need to reboot the computer to use