click start control panel administration tools computer management device manager scroll through all of your devices
if you see a yellow question or exclamation mark ? ! or a red X you will need to update the drivers for this device right click select update driver/reinstall driver
if you can see your usb device but its not working scroll to Ports(Com&Ltd) right click to update driver
if you computer came with a motherboard disk the drivers could be on it
or you might have to download them
rather doing a driver hunt which can take hours
http://download.cnet.com/slimdrivers-free/3000-18513_4-75279940.html
it might take some time being a freeware driver solution
note: it will find all of your outdated drivers
this is a free driver solutions they will automatically search for and find the correct driver also at cnet http://download.cnet.com/2000-20_4.html on the home page you should see a search tab just type in what you are looking for IE: motherboard name sound drivers you might have to try a few times to get it right
http://download.cnet.com/drivermax/3000-18513_4-10572602.html
Windows 2000/XP/Vista/7/8 free driver program
http://download.cnet.com/drivers-for-free/3000-18512_4-75548155.html
Windows XP/2003/Vista/Server 2008/7/8 free drivers
http://www.innovative-sol.com/drivermax/ free program, paid update available
hope it helps
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