I added a switch to my network because I needed more ports for my DirecTV receivers. Turns out the receivers don't play nice with the switch so I cannot port them to it. I have to port my desktop running windows 7 to the switch. Now I'm finding out that Homegroup isn't working well with the switch. I have a desktop hardwired and a laptop wireless. Laptop running Windows 7, also. Before I added an extra DirecTV receiver, everything was working fine using a 4 port router. Since adding the receiver, I have had to move the desktop connection to a Lynksys 4 port switch. The desktop can access the internet fine but cannot communicate with the laptop. I get "access denied...." message when I try to access the main hard drive on the desktop from the laptop. At first I thought it was a Windows 7 problem until I rewired back to original setup of just using the router. So basically the switch is causing some sort of blockage. Can anybody help?