virtualbox.org

Hi
I'm new to this Forum, I have searched it for possible fixes to my problem.
When I dubble click on VirtualBox in the programs menu, Vb starts up shortly and then terminates immidiately
Have tried to reinstall vb, but that didn't solve the issue.
I have attached some logs to clarify, maybe you can see what it wrong.
I have a windows 8 as a guest system and that is the only vm created so far.

upgraded to vb 4.2.4 still can't open vb, so removed vms from virtualbox vm folder, then vb starts. but if I create new vm and tries to start it I get this error:
Cannot open a session to the virtual machine
Failed to load VMMR0.r0
VERR_SYS_NON SYS Group

Retur kode:
NS_ERROR_FAILURE (0x80004005)
Komponent:
Console
Kort:
IConsole {db7ab4ca-2a3f-4183-9243-c1208da92392}