I'm french so sorry for my bad english ^^

I'm on Windows Vista and I need Salix on my computer for my homeworks. To aim to this and to avoid to "cut" my hard disc, I install VirtualBox.
I installed Salix and VirtualBox Addons without problems. But I want to create a shared folder between Vista and Salix.
That is the problem: I create a shared folder in VirtualBox and when I want to mount this folder on Salix (with command: mount -t vboxsf [Shared folder name] [/home/...]) Salix show me all possibilities of the command mount...

Have you an answer ?
I hope you understand me ^^"
Thank a lot.