Hi,
log into your 325, go to Management, system, device...what workgroup does it show. Then go to "open network and file sharing" by either right clicking the little "monitor" symbol in the lower right of your w7 machine and select it, or go through Control Panel. Open it up and right at the top, there will be a graphic of your windows machine, then your workgroup name, then "internet". These 2 should have the same workgroup name, and so should all the devices on your network if they are to communicate successfully. Check all machines and devices. If different adjust as necessary. Good luck
Edit: Reboot all devices if you change anything.