If the host icon is not appearing in your Systray, please open Task Manager (usually by clicking ctrl-alt-delete) and select the Processes tab. Find the Systray process, if there is one, and then select End Process.

Once the process has been ended, go to %programfiles%\LogMeIn\x86 (x64 for 64-bit OS) and find the Systray icon. Double-clicking this icon should cause the icon to re-appear.