We are running two Dell computers in our office, each using Vista Ultimate. They are on the same workgroup, and I can see both computers on the network. However, when I attempt to access either computer from the other one, I get this message: Error code: 0x80070005 Access is denied. I have no problem accessing the XP machines that are on the same network from the Vista machines. Network discovery/file sharing/printer sharing/public folder sharing are on. Password protection is off. Advanced permissions show that everyone is allowed. We use AVG for antivirus, and we have a D-Link router. I'm sure it's some simple thing I'm overlooking. Any suggestions?