It's possible the drivers and the software were messed up. Try going into Device Manager using Start > Run > devmgmt.msc. If the device isn't installed, right click and choose Update Driver then let Windows finish the procedure.
Secondly, if you have the CD with the drivers and the software for the USB Stick, insert it and launch the installation. You can either repair or remove the packages. I recommend a re-installation of the software, but first remove all the packages.