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
Path:%SystemRoot%\System32\drivers\umbus.sys
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 for UMBus Enumerator Driver

1. Select your Windows 8 edition and update pack, and then click Download.

2. Save the Win8_umbus_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. Restart the computer.

The umbus service is using the umbus.sys file that is located in the %WinDir%\System32\drivers folder. If the file is corrupted or deleted, you can put it back in there.