Virtual Machine Bus (vmbus) Service Defaults in Windows 11
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 driver. In Windows 11 it starts only if the user, an application or another service starts it. If Virtual Machine Bus fails to start, the failure details will be recorded into Event Log. Then Windows 11 should boot up and notify the user about the vmbus service startup failure.
Restore Default Startup Configuration of 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 C:\Windows\System32\drivers directory. If the file is removed or corrupted, read this article to restore its original version from Windows 11 installation media.