This behavior can occur because of a modem driver error or an invalid modem-related Windows Registry entry.
The Ptvcd.vxd virtual device driver, which is part of the PCTell modem driver files, may be loading as a StaticVXD entry in the Windows registry.
To resolve this issue, use either of the following methods.
Method 1: Uninstall the PCTell Chip-Set Winmodem
You can uninstall some PCTell chip-set modems by clicking Add/Remove Programs in Control Panel. This is the recommended way to remove the Ptvcd.vxd file. If there is no reference to the PCTell Winmodem under Add/Remove Programs, contact PCTell or your computer's manufacturer (if this modem came preinstalled) for information about uninstalling the modem.
To uninstall the modem by using Add/Remove Programs, follow these steps:
Click Start, point to Settings, and then click Control Panel.
In Control Panel, double-click Add/Remove Programs.
Search for the PCTell Winmodem in the list of installed programs. When you locate it, select it, click the Install/Uninstall button, and then follow the uninstall directions.
Method 2: Delete the StaticVXD Entry from the Windows Registry
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
This procedure will disable the PCTell Winmodem. Browse to the following PCTell Web site for updated driver information:
To delete the StaticVXD entry from the Windows Registry, follow these steps:
Start your computer in Safe mode.
Click Start, and then click Run.
In the Open box, type regedit, and then click OK.
In Registry Editor, expand the following subkey:
NOTE: If your computer has more than one modem, a registry subkey may appear for each installed modem. For example:
Follow steps 5 through 7 to delete the StaticVXD entry for each of these subkeys.
In the right pane, click the StaticVXD entry that has a Data value of Ptvcd.vxd in the Name list.
On the Edit menu, click Delete.
On the Confirm Value Delete message that appears, click Yes.
Quit Registry Editor, and then restart the computer.