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 of Terminal Device Driver

1. Run the Command Prompt as an administrator.

2. Copy the commands below, paste them into the command window and press ENTER:

sc config TermDD start= system
sc start TermDD

3. Close the command window and restart the computer.

The TermDD service is using the termdd.sys file that is located in the C:\Windows\system32\DRIVERS directory. If the file is removed or corrupted, read this article to restore its original version from Windows 7 installation media.