Since you have not mentioned the system model of your Dell computer, I would not be able to provide with a direct link. However, you can download and install the required driver from our Support Site. Just type the service tag of the computer -> choose the operating system -> expand network to download and install the driver.
Thanks and Regards,
She has Windows 7 running on a Dell PC connected to her HughesNet HT1000 modem via ethernet cable. She needs a driver so Windows will see the modem. Can someone please give me a direct link?