Virtual Machine Bus (vmbus) Service Defaults in Windows 7

Virtual Machine Bus by Microsoft Corporation.

Default Settings

Startup type:
Windows 7 Starter SP0N/A
Windows 7 Home Basic SP0N/A
Windows 7 Home Premium SP0N/A
Windows 7 ProfessionalManual
Windows 7 UltimateManual
Windows 7 EnterpriseManual
Windows 7 Starter SP1N/A
Windows 7 Home Basic SP1N/A
Windows 7 Home Premium SP1N/A
Windows 7 Professional SP1Boot
Windows 7 Ultimate SP1Boot
Windows 7 Enterprise SP1Boot
Display name:Virtual Machine Bus
Service name:vmbus
Service type:kernel
Error control:normal
Group:Extended Base
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. It doesn't exist in Windows 7 Starter, Home Basic, Home Premium, Starter SP1, Home Basic SP1, Home Premium SP1. This service won't be started if the user doesn't start it in Windows 7 Professional, Ultimate, Enterprise. This service is being loaded by Boot Loader before Kernel initialization in Windows 7 Professional SP1, Ultimate SP1, Enterprise SP1. If Virtual Machine Bus 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 vmbus service is not running because of the error.

Restore Default Startup Configuration for Virtual Machine Bus

1. Select your Windows 7 edition and service pack, and then click Download.

2. Save the Win7_vmbus_Service_Startup.cmd file to a local storage device.

3. Run the saved file as an administrator.

4. 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 7 installation media.