I installed the latest boinc clien/manager, and virtualbox. I added the Atlas@Home, but in the log always write this message: Message from server: VirtualBox version 3.2 or later is required
But the VirtualBox version is 4.3.18
What do I wrong? Any idea?

Since it's a message from the Atlast@Home server, you best ask on their forums. Checking them, I see this thread stating the same as you see. If that isn't your thread already, best add to it.

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But the boinc client check the virtualbox version number, and the boinc client send this number to atlas server. Not?

Yes, but we don't know what their server does with that information, how it interprets it. For all we know it has a condition set that says 4.3 is lower than 3.2, therefore anything with "message from server" is a project problem.

You can check in your BOINC event log (or stdoutdae.txt) what version VirtualBox it detects.

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I found one little thing:
Virtualbox version: WARNING: The vboxdrv kernel module is not loaded. Either there is no module

But when Virtualbox install/configure, I use this command

service vboxdrv setup

and look like everithing ok:
Stopping VirtualBox kernel modules ok
Uninstalling old VirtualBox DKMS kernel modules ok
Trying to register the VirtualBox kernel modules using DKMS ok
Stating VirtualBox kernel module ok

lsmod | grep vbox command output:
vboxpci
vboxnetapi
vboxnetflt
vboxdrv