Have you tried running in safe mode?
Normally if this happens to me I just restart  and it comes right.
Have you tried looking at device manager and disabling the port and
seeing if anything objects?
RP

On 18/01/07, John Pfaff <jpfaff1528@verizon.net> wrote:
> I've looked all over, and can't find the answer on my own, so I'm asking
> the smartest bunch of people I know.
> I'm using Windows XP, and can't use one of the serial ports.  I'm trying
> to install a drawing tablet that uses the serial port, but now matter
> what I try (Hyper Terminal, Tera Term, PortMon, other programs that use
> the serial port), nothing can use it.  The error message I get says that
> something else is using the telephony device.  Is there any way I can
> tell what process is using the serial port?  I've tried Googling.  About
> the closest thing I've found is a Microsoft utility called PortMon, but
> even that can't attach to the serial port and won't/can't tell me what
> is using it.
> I don't know if the serial port has ever worked properly on this PC.
> I've checked BIOS settings for the port.  Is there any possibility that
> Norton Internet Security is doing something?
>
> Thanks,
> John Pfaff
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