Hi,
The driver should be installed via Device Manager, see the following steps:
1) Run the bulk_loopback_app and connect your USB lead to your PC; Note you may or may not receive notification of its failure.
2) Locate the driver in Device Manager as Other devices : Blackfin USB Device
3) Right-click and select Update Driver Software
4) Select Browse my computer for driver software and navigate to Blackfin\Examples\usb\host\windows\drivers, and click Next to install the driver.
5) You will be asked if you would you like to install this device software? Click Install
You should be all set.
Let me know how you get on.
Regards,
Colin.