First off, ensure that the guest has a network card and then make sure the status (In Vmware Player) is set to connected.
If you are still having problems, to try and rule out Firewalls or anything else, try setting the network mode (In Vmware Player) to Bridged as this should assign the Virtual Machine its own IP and appear on the network as a stand alone computer.
If you are still having problems, do you have DHCP or fixed settings? If it is fixed, you will need to apply those settings to the guest (unless in NAT mode).
If this does not work, please say in comments and I will try to come up with more.