proxmox and windows 7 64 bits

Hi all,

I'm a newbie with proxmox.
no problem to install proxmox 3.1 itself.
I try now to create a Windows 7 64 bits VM.
During the windows install, it asks me CD/DVD drivers ("CD/DVD drivers are missing").
However I boot the VM using a Windows iso file.
I google this afternoon without finding anything :-(
any help would be appreciate !
thanks
Bruno