[1] Open your Computer Management Console - go to Start | Settings | Control Panel | Admin Tools | Computer Management.
[2] Within the CMC, click the Device Manager node on the left.
[3] Expand the Sound, Video and Game Controllers node on the right
[4] Find your Echo MiaMIDI in the device list (may be more than one entry)
[5] For each entry in [4], right-click the Echo MiaMIDI and verify the Device Status reads something like "This device is working properly."
Respond back here with:
[a] which Echo devices are in the list
their status, i.e. working properly or some kind of conflict