VirtualBox upgrade: E_ACCESSDENIED

I just tried upgrading VirtualBox from 3.1.something to 4.0.6 on my Windows Vista (ultimate, 64-bit) host. I did the installation under an Administrator account. Now I'm trying to use it from a different account, and I get:

Failed to create the VirtualBox COM object. The application will now terminate. Details Callee RC: E_ACCESSDENIED (0x80070005)

Running VirtualBox from the Administrator account works fine.

Is there a workaround for this? Is there a way to run VirtualBox from my normal user account?

Is there a way to find out exactly what it's unable to get access to? As I have an Administrator account here, I should be able to grant any necessary permissions to my user account, if I know what to do.

Have you try the right-click "Use as administrator" option?

You'll have to introduce the user and password of an user with administration privileges.

hope it works ;D