If you have installed the application, go to Device manager and check to see if there are no devices left uninstalled. Use Start > Run > devmgmt.msc to access that section. If there is something in yellow, right-click it and select Update Driver, then let Windows install the device.
Secondly, remove the software and everything related to the application, insert the CD or attach the device to another USB port and initiate the installation through Autorun or using the the drive newly created in the Computer/My Computer.
A reinstallation will replace the files and possibly fix the connection issues.