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My VBOX 4.3.20 does not start on Windows 8.1 64 bits raising the following exception: VERR_MAIN_CONFIG_CONSTRUCTOR_COM_ERROR


The logfile shows:

VirtualBox VM 4.3.20 r96997 win.amd64 (Nov 24 2014 11:05:59) release log
00:00:01.675745 Log opened 2015-01-02T13:16:50.169996900Z
00:00:01.675746 Build Type: release
00:00:01.675748 OS Product: Windows 8.1
00:00:01.675749 OS Release: 6.3.9600
00:00:01.675750 OS Service Pack:
00:00:01.702472 DMI Product Name: Satellite P55t-B
00:00:01.705299 DMI Product Version: PSPNVU-00U00W
00:00:01.705304 Host RAM: 16294MB total, 12002MB available
00:00:01.705306 Executable: C:\Program Files\Oracle\VirtualBox\VirtualBox.exe
00:00:01.705307 Process ID: 7600
00:00:01.705308 Package type: WINDOWS_64BITS_GENERIC
00:00:01.713196 Installed Extension Packs:
00:00:01.713219 Oracle VM VirtualBox Extension Pack (Version: 4.3.20 r96996; VRDE Module: VBoxVRDP)
00:00:01.717557 UIMediumEnumerator: Medium-enumeration finished!
00:00:01.785658 SUP: Loaded VMMR0.r0 (C:\Program Files\Oracle\VirtualBox\VMMR0.r0) at 0xfffff8009b02c000 - ModuleInit at fffff8009b04b6e0 and ModuleTerm at fffff8009b04b9f0 using the native ring-0 loader
00:00:01.785677 SUP: VMMR0EntryEx located at fffff8009b04cc20, VMMR0EntryFast at fffff8009b04bd70 and VMMR0EntryInt at fffff8009b04bd60
00:00:01.785681 SUP: windbg> .reload /f C:\Program Files\Oracle\VirtualBox\VMMR0.r0=0xfffff8009b02c000
00:00:01.789904 Guest OS type: 'WindowsXP'
00:00:01.792164 fHMForced=true - SMP
00:00:01.799365 File system of 'C:\Program Files\Oracle\VirtualBox\VBoxGuestAdditions.iso' (DVD) is ntfs
00:00:01.802796 File system of 'D:\VM\WINXP_VM1\Snapshots' (snapshots) is unknown
00:00:01.802806 File system of 'D:\VM\WINXP_VM1\WINXP_VM1-disk1.vmdk' is ntfs
00:00:01.805397 File system of 'D:\VM\WINXP_VM1\WINXP_VM1.vmdk' is ntfs
00:00:01.808016 File system of 'D:\VM\WINXP_VM1\WINXP_VM1-disk2.vmdk' is ntfs
00:00:01.923445 AssertLogRel F:\tinderbox\win-4.3\src\VBox\Main\src-client\ConsoleImpl2.cpp(2433) int __cdecl Console::configConstructorInner(struct UVM *,struct VM *,class util::AutoWriteLock *): !FAILED(hrc)
00:00:01.923457 hrc=TYPE_E_ELEMENTNOTFOUND
00:00:02.050416 VMSetError: F:\tinderbox\win-4.3\src\VBox\VMM\VMMR3\VM.cpp(365) int __cdecl VMR3Create(unsigned int,const struct VMM2USERMETHODS *,void (__cdecl *)(struct UVM *,void *,int,const char *,unsigned int,const char *,const char *,char *),void *,int (__cdecl *)(struct UVM *,struct VM *,void *),void *,struct VM **,struct UVM **); rc=VERR_MAIN_CONFIG_CONSTRUCTOR_COM_ERROR
00:00:02.050435 VMSetError: The configuration constructor in main failed due to a COM error. Check the release log of the VM for further details.
00:00:02.050641 ERROR [COM]: aRC=E_FAIL (0x80004005) aIID={8ab7c520-2442-4b66-8d74-4ff1e195d2b6} aComponent={Console} aText={The configuration constructor in main failed due to a COM error. Check the release log of the VM for further details. (VERR_MAIN_CONFIG_CONSTRUCTOR_COM_ERROR)}, preserve=false
00:00:02.065491 Power up failed (vrc=VERR_MAIN_CONFIG_CONSTRUCTOR_COM_ERROR, rc=E_FAIL (0X80004005))
00:00:02.078202 UIMachineView::storeGuestSizeHint: Storing guest size-hint for screen 0 as 640x480



Any information?

Same problem. Any luck?

Minimum information needed for assistance.

Note the part about providing a complete log as a zipped attachment. A pasted partial log is not useful.

I can tell you that COM errors are usually due to not installing the software properly on a Win64 host. For example, installing for the "Admin user" instead of installing for the correct user, but using "Run as administrator".