To me it sounds like you have a network configuration issue, fire up the CMD and type Ipconfig, that should return an IP address in one of the following ranges, 192.168.x.x or 10.0.0.x. If you are not obtaining an ip address in this range, you will need to power down your VM, and make sure the network settings are set to Bridged mode.
Once its been set to bridged mode, head back to CMD and try pinging an internal host or google.com for instance. If you receive a reply back, then you should be fine.