When getting emokit set up for the first time I noticed that the setupWin() in emotiv.py was failing to find my headset. I determined that the vendor_id and product_name attributes for my headset were different than those hardcoded into the setupWin() function. Below are the printouts for the two emotiv devices I found on my system:
[HID device (vID=0x1234, pID=0xed02, v=0x0003); Emotiv Systems Pty Ltd; Receiver Dongle L01, Path: ?\hid#vid_1234&pid_ed02&mi_00#7&6ac0ee5&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}]
[HID device (vID=0x1234, pID=0xed02, v=0x0003); Emotiv Systems Pty Ltd; Emotiv RAW DATA, Path:
?\hid#vid_1234&pid_ed02&mi_01#7&2a834ca7&0&0000#{4d1e55b2-f16f-11cf-88cb-001111000030}]
...and here's the modification I had to make to setupWin() to get emotiv.Emotive() to run
filter = hid.HidDeviceFilter(vendor_id=0x1234, product_name='Emotiv RAW DATA')
I'm not sure if they've just changed these values recently (I bought it in July '10), or if mine is just different because it's the developer headset.