I tried to attach a M-audio 88es USB MIDI keyboard to my Dell Studio 1747 laptop (Windows 7 Home Premium x64). The keyboard is correctly identified on the USB, M-audio's drivers
installed and this shows up in any MIDI software I start, but nothing can be transmitted from the keyboard to the computer.
The usb keyboard works with other computers, and the Dell Studio sound system can play MIDI files. To make sure I alternated to an external Creative XFi soundblaster audio unit, which should have all MIDI capabilities, but again no sound from the keyboard (actually, a field in the recording software would show up if MIDI instructions were received).
Is there more I can try?