I know it's not a problem with the Launcher because the Windows XP machine I have EnB Emu installed on has yet to have any issues.
But under Windows Vista this is a constant issue.
About once a week, I begin getting the dread (Not Responding) from the launcher. If I am very patient, it will eventually work it's weak little brain around it and complete the scan for updates. The only solution I have found has been to remove the NET7 directory and the LaunchNet7 folder from AppData and reinstall the launcher.
Every launch, I have to reset the updates. The launcher has nothing updated, but the client has several files that need to update. The critical one, I think, is the network.ini file. If I don't do this before launch, I get to the login screen okay, but when I type the password and hit enter, the "hand" never lights up and I go back to the desktop looking at the DOS window that initiates the proxy.
Just posting what I do to keep this running under Vista for others that may encounter the same trouble.
I'm too lazy to install XP on my main machine, and too cheap at the moment to upgrade to Windows 7