COM object fail to aquire error

[Boot Virtual]

Hello! I need some help using VirtualBox. I've used VirtualBox one year on my computer and now I try to open it but it gives me the following error:

Failed to acquire the VirtualBox COM object.
The application will now terminate.

Document is empty.
Location: 'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml', line 1 (0), column 1.
F:\tinderbox\win-6.0\src\VBox\Main\src-server\VirtualBoxImpl.cpp[624] (long __cdecl VirtualBox::init(void)).

Result Code: E_FAIL (0x80004005)
Component: VirtualBoxWrap
Interface: IVirtualBox {d0a0163f-e254-4e5b-a1f2-011cf991c38d}
Callee: IVirtualBoxClient {d2937a8e-cb8d-4382-90ba-b7da78a74573}

I've reinstalled VirtualBox 10 times but I have the same error. If you have a solution for that please tell me.

Boot Virtual

[mpack]

I suspect Windows had a feature update, which messed with the VirtualBox registry settings.

Try reinstalling VirtualBox.

[socratis]

Document is empty.
Location: 'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml', line 1 (0), column 1.

Unfortunately this XPCOM message can come from more things than the registry alone, this error for example is common on OSX and Linux Hosts.

'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml' is a zero-byte file. If there's a non-zero-byte file named 'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml-prev', then copy that to 'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml'.

Or else delete the whole 'C:\Users\Marc-Tudor\.VirtualBox\VirtualBox.xml' file altogether, it will be properly recreated.