Brad, it seems like the change in your router is causing issues with accessing the shared drives between your Windows 7 X64 and Mac machines. The fact that the shared drives ask for credentials and then fail to connect indicates an authentication or permissions issue. Here are some steps you can take to troubleshoot and resolve this issue: 1. Check Network Discovery and File Sharing Settings: - Ensure that Network Discovery and File Sharing are enabled on both the Windows 7 machine and the Mac. - On the Windows 7 machine, go to Control Panel > Network and Sharing Center > Change advanced sharing settings. Make sure that Network Discovery and File and Printer Sharing are turned on for the appropriate network profile (Home, Work, or...