Hey Viking,
If you installed a driver for the device then all you have to do is uninstall the driver. For example if I wanted to use a DAQPad I would just uninstall NI-DAQ.
However, Windows ships with drivers for several USB devices. In this case you have a few options. After creating your .inf file and installing it you can go to the device manager and click update driver for the device and then manually select the .inf file you created instead of the default one that windows uses.
You could also search the inf files on your computer (normally at C:\Windows\inf) for a file that contains your specific vendor and device ID. Then comment out the line that references your device.
I hope this helps out.
JoshuaP
National Instruments
