Verify that indeed it's the computer or USB device that's failing if possible by using the device on another computer.
Also it's possible the USB device requires a 2.0 interface but your dell MB only provides 1.x, or that it has a larger power requirement then that USB port will provide.
Drivers:
Go to http://support.dell.com/ and make sure you are using a, and the proper chipset driver and see if there are any supplemental USB drivers/fixes there.
Assuming your OS is windows, it might be a good idea to go to
http://www.update.microsoft.com and make sure you have all the updates (with a possible hardware one).
Else if you determine the USB port is bad or necessary (to meet 2.0 or power requirement) , you can always get a USB port PCI card.
You can buy a 5 port USB card for around as low as $5 USD online.
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