Hi.  I downloaded and installed Dell Dock on my Inspiron 1521 yesterday, but when I try to run it I get this message: "In order to complete installation, the Dell Dock must be activated.  Please ensure you are connected to the internet and that the Dell Dock is not blocked by a firewall and try again.  No personal information is sent in the process."  I am not aware of any firewalls running on my system and I am connected to the internet.  What should I do?  Thanks in advance for your help.