[vbox-dev] Changing settings using VBoxManage failed

[xiekunming]

hi, i am try to debug video wddm driver.

i follow https://www.virtualbox.org/wiki/VBoxLogging
try to Change log settings, but it occurs error,

C:\Program Files\Oracle\VirtualBox>VBoxManage.exe debugvm "win7-32"  
logflags --debug
VBoxManage.exe: error: Failed to create the VirtualBox object!
VBoxManage.exe: error: Code CO_E_SERVER_EXEC_FAILURE (0x80080005) - 
Server execution failed (extended info not available)
VBoxManage.exe: error: Most likely, the VirtualBox COM server is not 
running or failed to start.


HOST OS:WIN 10 (64BIT)
GUEST OS: win 7 (32 bit)
VBOX VERSION :4.2.12 (compatie win 8)