Windows 2008 R2 x64 on xen - a required cd dvd driver is missing error

I am running OpenSuse 11.2 64bit distro. I’ve successfully installed xen hypervisor using yast2 tool and then created (using yast2 as well) a new virtual machine with Windows 2008 R2 x64 as a guest (specyfing an .img file as CD/DVD Drive).
The installtion boots succesfully, i am able to start the setup process but after a while i get “a required CD/DVD drive device driver is missing” error and the setup cannot continue…
Did anyone encounter similar error? Did anyone succeed in installing win2008r2 x64 on opensuse?
Hmm could this error be caused by the fact that the cd/dvd rom drive has non-standard size ? (0.7 GB)