I've been using MIDI "M-AUDIO Keystation 88es" for more than 4 years on my PC. Yesterday I tried to connect the MIDI keyboard to my notebook (Windows 7 64bit SP1). I had installed the current driver "USB_MIDI_Series_Installer_5_0_1_Driver_5_10_0_5139" to the OS and connected MIDI via USB. But in Device Manager, the midi keyboard looks like "Unknown Device". I can't play on notebook, but it's ok on PC (OS is -Windows 7 64bit SP1 too). How can I fix this problem?