Kernel driver not accessible

[Francexi]

Good morning/evening
I'm trying to run a Virtual Machine on Slackware. When I try to start it, VirtualBox reports: "Kernel driver not accessible". I checked /dev/vboxdrv

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crw-rw---- 1 root vboxusers 10, 59 apr 16 11:05 /dev/vboxdrv

and obviously my user is member of vboxusers group (I check using "groups").

Any idea of how to resolve?

[Francexi]

Replying for bumping and add some informations.

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# lsmod | grep vbox
vboxnetadp             28672  0
vboxnetflt             32768  0
vboxdrv               520192  2 vboxnetadp,vboxnetflt

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$ groups francesco
francesco : francesco lp audio video cdrom apache plugdev power scanner users bumblebee vboxusers