USB Host Support Library (Ucx01000) Service Defaults in Windows 10

USB Controller Extension by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:USB Host Support Library
Service name:Ucx01000
Service type:kernel
Error control:normal
Group:Boot Bus Extender
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Ucx01000

Default Behavior

USB Host Support Library is a kernel device driver. In Windows 10 it is starting only if the user, an application or another service starts it. If USB Host Support Library fails to start, the failure details are being recorded into Event Log. Then Windows 10 will start up and notify the user that the Ucx01000 service has failed to start due to the error.


While USB Host Support Library is stopped, disabled or working incorrectly, the following services do not start:

Restore Default Startup Configuration of USB Host Support Library

1. Run the Command Prompt as an administrator.

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

sc config Ucx01000 start= demand

3. Close the command window and restart the computer.

The Ucx01000 service is using the ucx01000.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 10 installation media.