Terminal Device Driver (TermDD) Service Defaults in Windows 7

Remote Desktop Server Driver by Microsoft Corporation.

Default Settings

Startup type:System
Display name:Terminal Device Driver
Service name:TermDD
Service type:kernel
Error control:normal
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermDD

Default Behavior

Terminal Device Driver is a kernel device driver. In Windows 7 it is being loaded at Kernel initialization. If Terminal Device Driver fails to start, Windows 7 attempts to write the failure details into Event Log. Then Windows 7 startup should proceed and the user should be notified that the TermDD service is not running because of the error.


If Terminal Device Driver is stopped, the Remote Desktop Services fails to start and initialize.

Restore Default Startup Configuration for Terminal Device Driver

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_TermDD_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The TermDD service is using the termdd.sys file that is located in the %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.