Hi. I'm having a similar problem. I upgraded from Vista to Windows7, and am having issues connecting with any nonWindows program. I was running LW5 on Vista, but when I upgraded, it stopped working. I uninstalled/reinstalled several times, added it to Norton and Windows Firewall, but kept getting the error message about adding LW as a firewall exception/loopback connection. I uninstalled and downloaded FrostWire 4.18.5. Java didn't work after the upgrade, either, so I dowloaded that, and am running 6.0.170.4. I've searched the threads and tried what fixes I could, but still nothing.
I have 4 GB of ram, and 3.75 GB available. I am connecting from home via dialup w/Earthlink and a Conexant PCI CX11252-41Z Soft Modem (I don't know if I am port forwarding or UpnP Enabled; I Searched for it, and it didn't come up). I am not sharing my connecting, and "my test worked." I uninstalled Norton, and am running Windows Firewall, but I can't connect w/FW even when I turn it off. I'm in the USA.
I have tried support forums everywhere I could think of (Gateway, Microsoft, Earthlink), but can't get my issues fixed. Thank you.