kvm_intel error

Hi all,

we have install proxmox dvd on hp dl360g5 with intel L5420 (E5420).

We have the following error line on kvm:

modprobe kvm-intel
FATAL: Error inserting kvm_intel (/lib/modules/2.6.32-16-pve/kernel/arch/x86/kvm/kvm-intel.ko): Invalid module format

on startup we get:

kvm: disabled by bios

What can we do here?
Virtualisation is activate in bios.

Please help. Thanks.

regards