Happy.Exe:

Happy.Exe Removal

Manual Removal

• Deletes the SKA.EXE and SKA.DLL files
  
• Modifies WSOCK32.DLL.
  
• It removes the following Windows Registry modification
  HKEY_LOCAL_MACHINE\Software\Microsoft\Windows
  \CurrentVersion\RunOnce=SKA.EXE
  
• Happy99.Worm adds this Windows Registry entry
  if WSOCK32.DLL is in use when the worm attempts
  to modify it (i.e. a user is online or connected to a network).