Virtual Machine Bus (vmbus) Service Defaults in Windows 10

Microsoft Hyper-V Virtual Machine Bus Child Driver by Microsoft Corporation.

Default Settings

Startup type:Manual
Display name:Virtual Machine Bus
Service name:vmbus
Service type:kernel
Error control:normal
Group:System Bus Extender
Path:%SystemRoot%\System32\drivers\vmbus.sys
Registry key:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\vmbus

Default Behavior

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

Restore Default Startup Configuration for Virtual Machine Bus

1. Run the Command Prompt as an administrator.

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

sc config vmbus start= demand

3. Close the command window and restart the computer.

The vmbus service is using the vmbus.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 10 installation media.