Hi ,
Another effective way to do that. Download CC USB Firmware Library and Examples (Rev. C) . Unzip it wherever you want. Insert the Dongle. Right click on my computer->manage->device Manager here u can find TI CC2531 USB CDC , double click it -> update driver-> brows the location where u have unzipped CC USB Firmware Library and Examples (Rev. C) , inside that there will be a driver folder , point to that folder then click next. And it is done.
Thnaks
Biprangshu saha