I would look in the event logs on the remote PC for clues...
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Al Jarvi (MS-MVP Windows – Desktop User Experience)
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"Greg" <Greg@discussions.microsoft.com> wrote in message
news:1C84F3B4-90C5-42CD-B4D7-C1D5E86B5DF8@microsoft.com...
> Recently, I have been unable to log in using remote desktop. I have
> received
> the following problem on the same day each of the last three weeks. And
> it
> requires a reboot of the remote computer, and then it works fine. The
> problem is that someone isn't always available to reboot the computer.
> This
> is the error message:
>
> "Error connecting to existing session for {username} (Id 0) A device
> attached to the system is not functioning."
>
> I have a dell dimension 4300, running xp pro sp2.
>