|Do any USB devices work on that computer?|
If so, the USB1.1 driver isn't the problem, because USB2.0 is backwards compatible.
Are there any yellow exclamation marks showing in device manager?
If not, you don't need a driver.
Have you tried connecting the camera to another computer?
Does it work?
If not, she may need a new USB cable for it. They quite often die without warning.
That's about as much help as you'll get, considering the lack of information/details.
Hope it helps.
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