One good try at a fix is to remove the Root Hub drivers and refind them.

Go to Start/Run, and type DEVMGMT.MSC , highlight the USB Root Hub devices,
Action menu, "Uninstall", (do Not put a check in 'delete driver") then
Action menu,"scan for hardware changes", to find the device drivers again
automatically.

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Mark L. Ferguson
..

"SteveB" <SteveB@discussions.microsoft.com> wrote in message
news:F4AE72E0-DA54-4800-8403-99BE9305D5BE@microsoft.com...[color=blue]
> Hi
> Have a problem with all of the USB ports on my Dell Laptop. It has been
> fine and the USB ports were all working. I have gone to use them and have
> tried to attach a memory stick, digital camera, and other devices and
> nothing
> is being recognised. Does anyone have any ideas what I have done?
>
> The devices work on other computers.
> I dont really want to have to reinstall vista again as I will lose
> everything.
>
> Thanks
> Steve[/color]