In Device Manager (devmgmt.msc) you can open the Properties of the modem
device, and use the Driver tab button to "Roll Back driver"

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Mark L. Ferguson MS-MVP
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"Theresa21" <Theresa21@discussions.microsoft.com> wrote in message
news:73B6E140-1304-4FAC-BB9B-0DD9ACEC9F65@microsoft.com...
> I've had my computer for years. Just yesterday I turned it on and there
> is a
> window saying it found new hardware and needs to install a modem. I
> haven't
> put on a new modem, nor uninstalled the old one. I cannot connect to the
> internet with my computer!
>
> So - how would my modem have disappeared? The only way I can think is
> through an automatic update from Microsoft.
> How do I get back connected to the internet?