UMBus Enumerator Driver Service Defaults in Windows 8

User-Mode Bus Enumerator by Microsoft Corporation.

Default Settings

Startup type: Manual
Display name:UMBus Enumerator Driver
Service name:umbus
Service type:kernel
Error control:normal
Group:Extended Base
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\umbus

Default Behavior

The UMBus Enumerator Driver service is a kernel device driver. In Windows 8 it will not be started until the user starts it. If UMBus Enumerator Driver fails to start, the error details are added to Windows 8 error log. When the operating system startup is complete, the user is being notified that the umbus service hasn't been started.

Restore Default Startup Configuration of UMBus Enumerator Driver

1. Run the Command Prompt as an administrator.

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

sc config umbus start= demand

3. Close the command window and restart the computer.

The umbus service is using the umbus.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 8 installation media.