after the installation of CAELinux2011 on a dell workstation, I don't manage to connect other computer file systems to share information over the network

at System/Preferences/Personal File Sharing, the option "Share Files over the network" gives the message "This feature cannot be enabled because the required packages are not installed on your system"

does enyone know what to do? which packages should I download ans install? and where to find them?

thank you in advance

Lluis