Vista - Problem with Telephony Service

Hi There,

I am trying to run HyperTerminal on my Vista x64 workstation in order to
configure Cisco switches. Problem is that when I try to open HyperTerminal I
get the following error: "another program is using the selected telephony
device. Try again after the other program completes." I cannot find ANY other
device that would use this service.

I do not have a modem, and I do connect my cell phone to the computer via
USB but it is currently NOT connected. In "Phone and Modem Options" I do have
a default location. I suspect this to be the culprit and would like to delete
but can't. I have disabled the Telephony Service, restarted the workstation
and restarted the service and continue to get the same error.

I know this can work, as the other engineers in my department are
functioning just fine. I am the only (un)lucky one with this problem.

Thanks for any help.
Debbie