So you bought one of those cheap ebay USB MIDI cables and it's not working on Windows 7? Don't throw it away just yet. Download the file below and extract its contents to a place in your computer:
http://www.mediafire.com/file/fgq03z3l4w3j1dl/generic-usb-midi-driver.zipNow open up Device Manager and look for the USB MIDI device with a yellow icon next to it. Right click on it and choose the 'Update Driver' option. Tell Windows you will "Browse my computer." Choose "Let me pick from a list of devices" and then choose "Have Disk." Click on "Browse" and navigate to where you extracted the driver files. Select the file "emuxmidi.inf" and click on Open then OK then Next. If you get a warning message just say Yes (or Next) and let windows install the new drivers. You should see a brief progress bar and eventually be able to close the installation wizard.
With a little bit of luck your USB MIDI adapter should now be recognized and functioning properly.