This type of behavior generally means there is a connection issue. Are you on wireless? Are you using a USB WiFi Adapter? If so, it may have a problem. Can you use a wired connection?
Otherwise, these steps might help:
This type of behavior generally means there is a connection issue. Are you on wireless? Are you using a USB WiFi Adapter? If so, it may have a problem. Can you use a wired connection?
Otherwise, these steps might help: