UMBus Enumerator Driver Service Defaults in Windows 7

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

UMBus Enumerator Driver is a kernel device driver. In Windows 7 it won't be started if the user doesn't start it. If UMBus Enumerator 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 umbus service is not running because of the error.

Restore Default Startup Configuration for 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 %WinDir%\system32\DRIVERS folder. If the file is changed, damaged or deleted, you can restore its original version from Windows 7 installation media.