Hi,
Could you try the following:
1) Run the "Re-install virtual network adapter" item in the "Faveset Klink" program group in the Windows Start menu.
2) If 1 doesn't help, I suspect that a third-party (non-Microsoft) firewall program is getting in the way. Have you added new firewall/security software recently? If you do have a non-Microsoft firewall program installed, try making an exception for Klink's PC program in your firewall settings. Klink's PC program is usually located in:
c:\program files (x86)\faveset klink\adb.exe
AND
c:\program files (x86)\faveset klink\kclientgui.exe
Does that clear things up?
Kevin