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Thaks Perryg but it was a fresh install. I'll try your direction to reinstall after take a backup of the vdi files.

I've been instaled 3.0.6 yesterday on XP SP3 with 2 vms - mandriva and ubuntu and all works fine. Today after a machine reboot, I try to start VBox and a popupbox with the message : VirtualBox Critical error: Fail to create COM object to Virtualbox - The appl will be ended - Details box: RC do Chama...