opensuse11 and shared folders

[wildnux]

os: opensuse 11.0 (host: opensuse, guest: windows xp mce 2005)
installed virtualbox from sun's site. (not the ose)
installed the kernels and others except the virtual box from suse repo.
installed guest additions , every thing including usb works except folder sharing.
it says the networkname couldnot be found, error 67, ??

i found these lines included in suse boot log:

Starting VirtualBox Additions failed
(modprobe vboxadd failed)

Starting VirtualBox host networkingdone


Starting VirtualBox Additions shared folder support failed
(modprobe vboxvfs failed)

Starting VirtualBox kernel moduledone

Failed services in runlevel 5: vboxadd vboxvfs